Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Universal Host Controller Interface driver for USB. |
| 3 | * |
| 4 | * Maintainer: Alan Stern <stern@rowland.harvard.edu> |
| 5 | * |
| 6 | * (C) Copyright 1999 Linus Torvalds |
| 7 | * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com |
| 8 | * (C) Copyright 1999 Randy Dunlap |
| 9 | * (C) Copyright 1999 Georg Acher, acher@in.tum.de |
| 10 | * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de |
| 11 | * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch |
| 12 | * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at |
| 13 | * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface |
| 14 | * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com). |
| 15 | * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c) |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 16 | * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
| 18 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | /* |
| 21 | * Technically, updating td->status here is a race, but it's not really a |
| 22 | * problem. The worst that can happen is that we set the IOC bit again |
| 23 | * generating a spurious interrupt. We could fix this by creating another |
| 24 | * QH and leaving the IOC bit always set, but then we would have to play |
| 25 | * games with the FSBR code to make sure we get the correct order in all |
| 26 | * the cases. I don't think it's worth the effort |
| 27 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 28 | static void uhci_set_next_interrupt(struct uhci_hcd *uhci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | { |
Alan Stern | 6c1b445 | 2005-04-21 16:04:58 -0400 | [diff] [blame] | 30 | if (uhci->is_stopped) |
Alan Stern | 1f09df8 | 2005-09-05 13:59:51 -0400 | [diff] [blame] | 31 | mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 32 | uhci->term_td->status |= cpu_to_hc32(uhci, TD_CTRL_IOC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | } |
| 34 | |
| 35 | static inline void uhci_clear_next_interrupt(struct uhci_hcd *uhci) |
| 36 | { |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 37 | uhci->term_td->status &= ~cpu_to_hc32(uhci, TD_CTRL_IOC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | } |
| 39 | |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 40 | |
| 41 | /* |
| 42 | * Full-Speed Bandwidth Reclamation (FSBR). |
| 43 | * We turn on FSBR whenever a queue that wants it is advancing, |
| 44 | * and leave it on for a short time thereafter. |
| 45 | */ |
| 46 | static void uhci_fsbr_on(struct uhci_hcd *uhci) |
| 47 | { |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 48 | struct uhci_qh *lqh; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 49 | |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 50 | /* The terminating skeleton QH always points back to the first |
| 51 | * FSBR QH. Make the last async QH point to the terminating |
| 52 | * skeleton QH. */ |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 53 | uhci->fsbr_is_on = 1; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 54 | lqh = list_entry(uhci->skel_async_qh->node.prev, |
| 55 | struct uhci_qh, node); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 56 | lqh->link = LINK_TO_QH(uhci, uhci->skel_term_qh); |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 57 | } |
| 58 | |
| 59 | static void uhci_fsbr_off(struct uhci_hcd *uhci) |
| 60 | { |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 61 | struct uhci_qh *lqh; |
| 62 | |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 63 | /* Remove the link from the last async QH to the terminating |
| 64 | * skeleton QH. */ |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 65 | uhci->fsbr_is_on = 0; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 66 | lqh = list_entry(uhci->skel_async_qh->node.prev, |
| 67 | struct uhci_qh, node); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 68 | lqh->link = UHCI_PTR_TERM(uhci); |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 69 | } |
| 70 | |
| 71 | static void uhci_add_fsbr(struct uhci_hcd *uhci, struct urb *urb) |
| 72 | { |
| 73 | struct urb_priv *urbp = urb->hcpriv; |
| 74 | |
| 75 | if (!(urb->transfer_flags & URB_NO_FSBR)) |
| 76 | urbp->fsbr = 1; |
| 77 | } |
| 78 | |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 79 | static void uhci_urbp_wants_fsbr(struct uhci_hcd *uhci, struct urb_priv *urbp) |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 80 | { |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 81 | if (urbp->fsbr) { |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 82 | uhci->fsbr_is_wanted = 1; |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 83 | if (!uhci->fsbr_is_on) |
| 84 | uhci_fsbr_on(uhci); |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 85 | else if (uhci->fsbr_expiring) { |
| 86 | uhci->fsbr_expiring = 0; |
| 87 | del_timer(&uhci->fsbr_timer); |
| 88 | } |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 89 | } |
| 90 | } |
| 91 | |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 92 | static void uhci_fsbr_timeout(unsigned long _uhci) |
| 93 | { |
| 94 | struct uhci_hcd *uhci = (struct uhci_hcd *) _uhci; |
| 95 | unsigned long flags; |
| 96 | |
| 97 | spin_lock_irqsave(&uhci->lock, flags); |
| 98 | if (uhci->fsbr_expiring) { |
| 99 | uhci->fsbr_expiring = 0; |
| 100 | uhci_fsbr_off(uhci); |
| 101 | } |
| 102 | spin_unlock_irqrestore(&uhci->lock, flags); |
| 103 | } |
| 104 | |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 105 | |
Alan Stern | 2532178 | 2005-04-25 11:14:31 -0400 | [diff] [blame] | 106 | static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | { |
| 108 | dma_addr_t dma_handle; |
| 109 | struct uhci_td *td; |
| 110 | |
| 111 | td = dma_pool_alloc(uhci->td_pool, GFP_ATOMIC, &dma_handle); |
| 112 | if (!td) |
| 113 | return NULL; |
| 114 | |
| 115 | td->dma_handle = dma_handle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | td->frame = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | |
| 118 | INIT_LIST_HEAD(&td->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | INIT_LIST_HEAD(&td->fl_list); |
| 120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | return td; |
| 122 | } |
| 123 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 124 | static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td) |
| 125 | { |
Arjan van de Ven | 5172046 | 2008-09-20 19:09:37 -0700 | [diff] [blame] | 126 | if (!list_empty(&td->list)) |
| 127 | dev_WARN(uhci_dev(uhci), "td %p still in list!\n", td); |
| 128 | if (!list_empty(&td->fl_list)) |
| 129 | dev_WARN(uhci_dev(uhci), "td %p still in fl_list!\n", td); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 130 | |
| 131 | dma_pool_free(uhci->td_pool, td, td->dma_handle); |
| 132 | } |
| 133 | |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 134 | static inline void uhci_fill_td(struct uhci_hcd *uhci, struct uhci_td *td, |
| 135 | u32 status, u32 token, u32 buffer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | { |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 137 | td->status = cpu_to_hc32(uhci, status); |
| 138 | td->token = cpu_to_hc32(uhci, token); |
| 139 | td->buffer = cpu_to_hc32(uhci, buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
| 141 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 142 | static void uhci_add_td_to_urbp(struct uhci_td *td, struct urb_priv *urbp) |
| 143 | { |
| 144 | list_add_tail(&td->list, &urbp->td_list); |
| 145 | } |
| 146 | |
| 147 | static void uhci_remove_td_from_urbp(struct uhci_td *td) |
| 148 | { |
| 149 | list_del_init(&td->list); |
| 150 | } |
| 151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | /* |
Alan Stern | 687f5f3 | 2005-11-30 17:16:19 -0500 | [diff] [blame] | 153 | * We insert Isochronous URBs directly into the frame list at the beginning |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 155 | static inline void uhci_insert_td_in_frame_list(struct uhci_hcd *uhci, |
| 156 | struct uhci_td *td, unsigned framenum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | { |
| 158 | framenum &= (UHCI_NUMFRAMES - 1); |
| 159 | |
| 160 | td->frame = framenum; |
| 161 | |
| 162 | /* Is there a TD already mapped there? */ |
Alan Stern | a1d59ce | 2005-09-16 14:22:51 -0400 | [diff] [blame] | 163 | if (uhci->frame_cpu[framenum]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | struct uhci_td *ftd, *ltd; |
| 165 | |
Alan Stern | a1d59ce | 2005-09-16 14:22:51 -0400 | [diff] [blame] | 166 | ftd = uhci->frame_cpu[framenum]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list); |
| 168 | |
| 169 | list_add_tail(&td->fl_list, &ftd->fl_list); |
| 170 | |
| 171 | td->link = ltd->link; |
| 172 | wmb(); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 173 | ltd->link = LINK_TO_TD(uhci, td); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | } else { |
Alan Stern | a1d59ce | 2005-09-16 14:22:51 -0400 | [diff] [blame] | 175 | td->link = uhci->frame[framenum]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | wmb(); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 177 | uhci->frame[framenum] = LINK_TO_TD(uhci, td); |
Alan Stern | a1d59ce | 2005-09-16 14:22:51 -0400 | [diff] [blame] | 178 | uhci->frame_cpu[framenum] = td; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | } |
| 180 | } |
| 181 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 182 | static inline void uhci_remove_td_from_frame_list(struct uhci_hcd *uhci, |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 183 | struct uhci_td *td) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | { |
| 185 | /* If it's not inserted, don't remove it */ |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 186 | if (td->frame == -1) { |
| 187 | WARN_ON(!list_empty(&td->fl_list)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | return; |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 189 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 191 | if (uhci->frame_cpu[td->frame] == td) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | if (list_empty(&td->fl_list)) { |
Alan Stern | a1d59ce | 2005-09-16 14:22:51 -0400 | [diff] [blame] | 193 | uhci->frame[td->frame] = td->link; |
| 194 | uhci->frame_cpu[td->frame] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } else { |
| 196 | struct uhci_td *ntd; |
| 197 | |
Tobias Ollmann | 16325f1 | 2010-12-09 14:24:27 +0100 | [diff] [blame] | 198 | ntd = list_entry(td->fl_list.next, |
| 199 | struct uhci_td, |
| 200 | fl_list); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 201 | uhci->frame[td->frame] = LINK_TO_TD(uhci, ntd); |
Alan Stern | a1d59ce | 2005-09-16 14:22:51 -0400 | [diff] [blame] | 202 | uhci->frame_cpu[td->frame] = ntd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | } |
| 204 | } else { |
| 205 | struct uhci_td *ptd; |
| 206 | |
| 207 | ptd = list_entry(td->fl_list.prev, struct uhci_td, fl_list); |
| 208 | ptd->link = td->link; |
| 209 | } |
| 210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | list_del_init(&td->fl_list); |
| 212 | td->frame = -1; |
| 213 | } |
| 214 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 215 | static inline void uhci_remove_tds_from_frame(struct uhci_hcd *uhci, |
| 216 | unsigned int framenum) |
| 217 | { |
| 218 | struct uhci_td *ftd, *ltd; |
| 219 | |
| 220 | framenum &= (UHCI_NUMFRAMES - 1); |
| 221 | |
| 222 | ftd = uhci->frame_cpu[framenum]; |
| 223 | if (ftd) { |
| 224 | ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list); |
| 225 | uhci->frame[framenum] = ltd->link; |
| 226 | uhci->frame_cpu[framenum] = NULL; |
| 227 | |
| 228 | while (!list_empty(&ftd->fl_list)) |
| 229 | list_del_init(ftd->fl_list.prev); |
| 230 | } |
| 231 | } |
| 232 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 233 | /* |
| 234 | * Remove all the TDs for an Isochronous URB from the frame list |
| 235 | */ |
| 236 | static void uhci_unlink_isochronous_tds(struct uhci_hcd *uhci, struct urb *urb) |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 237 | { |
| 238 | struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv; |
| 239 | struct uhci_td *td; |
| 240 | |
| 241 | list_for_each_entry(td, &urbp->td_list, list) |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 242 | uhci_remove_td_from_frame_list(uhci, td); |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 243 | } |
| 244 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 245 | static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci, |
| 246 | struct usb_device *udev, struct usb_host_endpoint *hep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | { |
| 248 | dma_addr_t dma_handle; |
| 249 | struct uhci_qh *qh; |
| 250 | |
| 251 | qh = dma_pool_alloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle); |
| 252 | if (!qh) |
| 253 | return NULL; |
| 254 | |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 255 | memset(qh, 0, sizeof(*qh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | qh->dma_handle = dma_handle; |
| 257 | |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 258 | qh->element = UHCI_PTR_TERM(uhci); |
| 259 | qh->link = UHCI_PTR_TERM(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 261 | INIT_LIST_HEAD(&qh->queue); |
| 262 | INIT_LIST_HEAD(&qh->node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 264 | if (udev) { /* Normal QH */ |
Matthias Kaehlcke | 1eba67a | 2009-04-15 22:28:28 +0200 | [diff] [blame] | 265 | qh->type = usb_endpoint_type(&hep->desc); |
Alan Stern | 85a975d | 2007-01-08 12:01:43 -0500 | [diff] [blame] | 266 | if (qh->type != USB_ENDPOINT_XFER_ISOC) { |
| 267 | qh->dummy_td = uhci_alloc_td(uhci); |
| 268 | if (!qh->dummy_td) { |
| 269 | dma_pool_free(uhci->qh_pool, qh, dma_handle); |
| 270 | return NULL; |
| 271 | } |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 272 | } |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 273 | qh->state = QH_STATE_IDLE; |
| 274 | qh->hep = hep; |
| 275 | qh->udev = udev; |
| 276 | hep->hcpriv = qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 278 | if (qh->type == USB_ENDPOINT_XFER_INT || |
| 279 | qh->type == USB_ENDPOINT_XFER_ISOC) |
| 280 | qh->load = usb_calc_bus_time(udev->speed, |
| 281 | usb_endpoint_dir_in(&hep->desc), |
| 282 | qh->type == USB_ENDPOINT_XFER_ISOC, |
Kuninori Morimoto | 29cc889 | 2011-08-23 03:12:03 -0700 | [diff] [blame] | 283 | usb_endpoint_maxp(&hep->desc)) |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 284 | / 1000 + 1; |
| 285 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 286 | } else { /* Skeleton QH */ |
| 287 | qh->state = QH_STATE_ACTIVE; |
Alan Stern | 4de7d2c | 2006-05-05 16:26:58 -0400 | [diff] [blame] | 288 | qh->type = -1; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 289 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | return qh; |
| 291 | } |
| 292 | |
| 293 | static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 294 | { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 295 | WARN_ON(qh->state != QH_STATE_IDLE && qh->udev); |
Arjan van de Ven | 5172046 | 2008-09-20 19:09:37 -0700 | [diff] [blame] | 296 | if (!list_empty(&qh->queue)) |
| 297 | dev_WARN(uhci_dev(uhci), "qh %p list not empty!\n", qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 299 | list_del(&qh->node); |
| 300 | if (qh->udev) { |
| 301 | qh->hep->hcpriv = NULL; |
Alan Stern | 85a975d | 2007-01-08 12:01:43 -0500 | [diff] [blame] | 302 | if (qh->dummy_td) |
| 303 | uhci_free_td(uhci, qh->dummy_td); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 304 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | dma_pool_free(uhci->qh_pool, qh, qh->dma_handle); |
| 306 | } |
| 307 | |
| 308 | /* |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 309 | * When a queue is stopped and a dequeued URB is given back, adjust |
| 310 | * the previous TD link (if the URB isn't first on the queue) or |
| 311 | * save its toggle value (if it is first and is currently executing). |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 312 | * |
| 313 | * Returns 0 if the URB should not yet be given back, 1 otherwise. |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 314 | */ |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 315 | static int uhci_cleanup_queue(struct uhci_hcd *uhci, struct uhci_qh *qh, |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 316 | struct urb *urb) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 317 | { |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 318 | struct urb_priv *urbp = urb->hcpriv; |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 319 | struct uhci_td *td; |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 320 | int ret = 1; |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 321 | |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 322 | /* Isochronous pipes don't use toggles and their TD link pointers |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 323 | * get adjusted during uhci_urb_dequeue(). But since their queues |
| 324 | * cannot truly be stopped, we have to watch out for dequeues |
| 325 | * occurring after the nominal unlink frame. */ |
| 326 | if (qh->type == USB_ENDPOINT_XFER_ISOC) { |
| 327 | ret = (uhci->frame_number + uhci->is_stopped != |
| 328 | qh->unlink_frame); |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 329 | goto done; |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 330 | } |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 331 | |
| 332 | /* If the URB isn't first on its queue, adjust the link pointer |
| 333 | * of the last TD in the previous URB. The toggle doesn't need |
| 334 | * to be saved since this URB can't be executing yet. */ |
| 335 | if (qh->queue.next != &urbp->node) { |
| 336 | struct urb_priv *purbp; |
| 337 | struct uhci_td *ptd; |
| 338 | |
| 339 | purbp = list_entry(urbp->node.prev, struct urb_priv, node); |
| 340 | WARN_ON(list_empty(&purbp->td_list)); |
| 341 | ptd = list_entry(purbp->td_list.prev, struct uhci_td, |
| 342 | list); |
| 343 | td = list_entry(urbp->td_list.prev, struct uhci_td, |
| 344 | list); |
| 345 | ptd->link = td->link; |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 346 | goto done; |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 347 | } |
| 348 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 349 | /* If the QH element pointer is UHCI_PTR_TERM then then currently |
| 350 | * executing URB has already been unlinked, so this one isn't it. */ |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 351 | if (qh_element(qh) == UHCI_PTR_TERM(uhci)) |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 352 | goto done; |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 353 | qh->element = UHCI_PTR_TERM(uhci); |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 354 | |
Alan Stern | 85a975d | 2007-01-08 12:01:43 -0500 | [diff] [blame] | 355 | /* Control pipes don't have to worry about toggles */ |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 356 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 357 | goto done; |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 358 | |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 359 | /* Save the next toggle value */ |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 360 | WARN_ON(list_empty(&urbp->td_list)); |
| 361 | td = list_entry(urbp->td_list.next, struct uhci_td, list); |
| 362 | qh->needs_fixup = 1; |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 363 | qh->initial_toggle = uhci_toggle(td_token(uhci, td)); |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 364 | |
| 365 | done: |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 366 | return ret; |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | /* |
| 370 | * Fix up the data toggles for URBs in a queue, when one of them |
| 371 | * terminates early (short transfer, error, or dequeued). |
| 372 | */ |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 373 | static void uhci_fixup_toggles(struct uhci_hcd *uhci, struct uhci_qh *qh, |
| 374 | int skip_first) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 375 | { |
| 376 | struct urb_priv *urbp = NULL; |
| 377 | struct uhci_td *td; |
| 378 | unsigned int toggle = qh->initial_toggle; |
| 379 | unsigned int pipe; |
| 380 | |
| 381 | /* Fixups for a short transfer start with the second URB in the |
| 382 | * queue (the short URB is the first). */ |
| 383 | if (skip_first) |
| 384 | urbp = list_entry(qh->queue.next, struct urb_priv, node); |
| 385 | |
| 386 | /* When starting with the first URB, if the QH element pointer is |
| 387 | * still valid then we know the URB's toggles are okay. */ |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 388 | else if (qh_element(qh) != UHCI_PTR_TERM(uhci)) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 389 | toggle = 2; |
| 390 | |
| 391 | /* Fix up the toggle for the URBs in the queue. Normally this |
| 392 | * loop won't run more than once: When an error or short transfer |
| 393 | * occurs, the queue usually gets emptied. */ |
Alan Stern | 1393adb | 2006-01-31 10:02:55 -0500 | [diff] [blame] | 394 | urbp = list_prepare_entry(urbp, &qh->queue, node); |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 395 | list_for_each_entry_continue(urbp, &qh->queue, node) { |
| 396 | |
| 397 | /* If the first TD has the right toggle value, we don't |
| 398 | * need to change any toggles in this URB */ |
| 399 | td = list_entry(urbp->td_list.next, struct uhci_td, list); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 400 | if (toggle > 1 || uhci_toggle(td_token(uhci, td)) == toggle) { |
Alan Stern | db59b46 | 2006-08-31 14:18:39 -0400 | [diff] [blame] | 401 | td = list_entry(urbp->td_list.prev, struct uhci_td, |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 402 | list); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 403 | toggle = uhci_toggle(td_token(uhci, td)) ^ 1; |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 404 | |
| 405 | /* Otherwise all the toggles in the URB have to be switched */ |
| 406 | } else { |
| 407 | list_for_each_entry(td, &urbp->td_list, list) { |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 408 | td->token ^= cpu_to_hc32(uhci, |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 409 | TD_TOKEN_TOGGLE); |
| 410 | toggle ^= 1; |
| 411 | } |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | wmb(); |
| 416 | pipe = list_entry(qh->queue.next, struct urb_priv, node)->urb->pipe; |
| 417 | usb_settoggle(qh->udev, usb_pipeendpoint(pipe), |
| 418 | usb_pipeout(pipe), toggle); |
| 419 | qh->needs_fixup = 0; |
| 420 | } |
| 421 | |
| 422 | /* |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 423 | * Link an Isochronous QH into its skeleton's list |
| 424 | */ |
| 425 | static inline void link_iso(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 426 | { |
| 427 | list_add_tail(&qh->node, &uhci->skel_iso_qh->node); |
| 428 | |
| 429 | /* Isochronous QHs aren't linked by the hardware */ |
| 430 | } |
| 431 | |
| 432 | /* |
| 433 | * Link a high-period interrupt QH into the schedule at the end of its |
| 434 | * skeleton's list |
| 435 | */ |
| 436 | static void link_interrupt(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 437 | { |
| 438 | struct uhci_qh *pqh; |
| 439 | |
| 440 | list_add_tail(&qh->node, &uhci->skelqh[qh->skel]->node); |
| 441 | |
| 442 | pqh = list_entry(qh->node.prev, struct uhci_qh, node); |
| 443 | qh->link = pqh->link; |
| 444 | wmb(); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 445 | pqh->link = LINK_TO_QH(uhci, qh); |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | /* |
| 449 | * Link a period-1 interrupt or async QH into the schedule at the |
| 450 | * correct spot in the async skeleton's list, and update the FSBR link |
| 451 | */ |
| 452 | static void link_async(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 453 | { |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 454 | struct uhci_qh *pqh; |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 455 | __hc32 link_to_new_qh; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 456 | |
| 457 | /* Find the predecessor QH for our new one and insert it in the list. |
| 458 | * The list of QHs is expected to be short, so linear search won't |
| 459 | * take too long. */ |
| 460 | list_for_each_entry_reverse(pqh, &uhci->skel_async_qh->node, node) { |
| 461 | if (pqh->skel <= qh->skel) |
| 462 | break; |
| 463 | } |
| 464 | list_add(&qh->node, &pqh->node); |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 465 | |
| 466 | /* Link it into the schedule */ |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 467 | qh->link = pqh->link; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 468 | wmb(); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 469 | link_to_new_qh = LINK_TO_QH(uhci, qh); |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 470 | pqh->link = link_to_new_qh; |
| 471 | |
| 472 | /* If this is now the first FSBR QH, link the terminating skeleton |
| 473 | * QH to it. */ |
| 474 | if (pqh->skel < SKEL_FSBR && qh->skel >= SKEL_FSBR) |
| 475 | uhci->skel_term_qh->link = link_to_new_qh; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 476 | } |
| 477 | |
| 478 | /* |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 479 | * Put a QH on the schedule in both hardware and software |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 481 | static void uhci_activate_qh(struct uhci_hcd *uhci, struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 483 | WARN_ON(list_empty(&qh->queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 485 | /* Set the element pointer if it isn't set already. |
| 486 | * This isn't needed for Isochronous queues, but it doesn't hurt. */ |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 487 | if (qh_element(qh) == UHCI_PTR_TERM(uhci)) { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 488 | struct urb_priv *urbp = list_entry(qh->queue.next, |
| 489 | struct urb_priv, node); |
| 490 | struct uhci_td *td = list_entry(urbp->td_list.next, |
| 491 | struct uhci_td, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 493 | qh->element = LINK_TO_TD(uhci, td); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | } |
| 495 | |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 496 | /* Treat the queue as if it has just advanced */ |
| 497 | qh->wait_expired = 0; |
| 498 | qh->advance_jiffies = jiffies; |
| 499 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 500 | if (qh->state == QH_STATE_ACTIVE) |
| 501 | return; |
| 502 | qh->state = QH_STATE_ACTIVE; |
| 503 | |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 504 | /* Move the QH from its old list to the correct spot in the appropriate |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 505 | * skeleton's list */ |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 506 | if (qh == uhci->next_qh) |
| 507 | uhci->next_qh = list_entry(qh->node.next, struct uhci_qh, |
| 508 | node); |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 509 | list_del(&qh->node); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 510 | |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 511 | if (qh->skel == SKEL_ISO) |
| 512 | link_iso(uhci, qh); |
| 513 | else if (qh->skel < SKEL_ASYNC) |
| 514 | link_interrupt(uhci, qh); |
| 515 | else |
| 516 | link_async(uhci, qh); |
| 517 | } |
| 518 | |
| 519 | /* |
| 520 | * Unlink a high-period interrupt QH from the schedule |
| 521 | */ |
| 522 | static void unlink_interrupt(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 523 | { |
| 524 | struct uhci_qh *pqh; |
| 525 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 526 | pqh = list_entry(qh->node.prev, struct uhci_qh, node); |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 527 | pqh->link = qh->link; |
| 528 | mb(); |
| 529 | } |
| 530 | |
| 531 | /* |
| 532 | * Unlink a period-1 interrupt or async QH from the schedule |
| 533 | */ |
| 534 | static void unlink_async(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 535 | { |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 536 | struct uhci_qh *pqh; |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 537 | __hc32 link_to_next_qh = qh->link; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 538 | |
| 539 | pqh = list_entry(qh->node.prev, struct uhci_qh, node); |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 540 | pqh->link = link_to_next_qh; |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 541 | |
| 542 | /* If this was the old first FSBR QH, link the terminating skeleton |
| 543 | * QH to the next (new first FSBR) QH. */ |
| 544 | if (pqh->skel < SKEL_FSBR && qh->skel >= SKEL_FSBR) |
| 545 | uhci->skel_term_qh->link = link_to_next_qh; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 546 | mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | /* |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 550 | * Take a QH off the hardware schedule |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 552 | static void uhci_unlink_qh(struct uhci_hcd *uhci, struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 554 | if (qh->state == QH_STATE_UNLINKING) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | return; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 556 | WARN_ON(qh->state != QH_STATE_ACTIVE || !qh->udev); |
| 557 | qh->state = QH_STATE_UNLINKING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 559 | /* Unlink the QH from the schedule and record when we did it */ |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 560 | if (qh->skel == SKEL_ISO) |
| 561 | ; |
| 562 | else if (qh->skel < SKEL_ASYNC) |
| 563 | unlink_interrupt(uhci, qh); |
| 564 | else |
| 565 | unlink_async(uhci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | |
| 567 | uhci_get_current_frame_number(uhci); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 568 | qh->unlink_frame = uhci->frame_number; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 570 | /* Force an interrupt so we know when the QH is fully unlinked */ |
Alan Stern | ba297ed | 2010-06-09 17:34:39 -0400 | [diff] [blame] | 571 | if (list_empty(&uhci->skel_unlink_qh->node) || uhci->is_stopped) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | uhci_set_next_interrupt(uhci); |
| 573 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 574 | /* Move the QH from its old list to the end of the unlinking list */ |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 575 | if (qh == uhci->next_qh) |
| 576 | uhci->next_qh = list_entry(qh->node.next, struct uhci_qh, |
| 577 | node); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 578 | list_move_tail(&qh->node, &uhci->skel_unlink_qh->node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | } |
| 580 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 581 | /* |
| 582 | * When we and the controller are through with a QH, it becomes IDLE. |
| 583 | * This happens when a QH has been off the schedule (on the unlinking |
| 584 | * list) for more than one frame, or when an error occurs while adding |
| 585 | * the first URB onto a new QH. |
| 586 | */ |
| 587 | static void uhci_make_qh_idle(struct uhci_hcd *uhci, struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 589 | WARN_ON(qh->state == QH_STATE_ACTIVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 591 | if (qh == uhci->next_qh) |
| 592 | uhci->next_qh = list_entry(qh->node.next, struct uhci_qh, |
| 593 | node); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 594 | list_move(&qh->node, &uhci->idle_qh_list); |
| 595 | qh->state = QH_STATE_IDLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 597 | /* Now that the QH is idle, its post_td isn't being used */ |
| 598 | if (qh->post_td) { |
| 599 | uhci_free_td(uhci, qh->post_td); |
| 600 | qh->post_td = NULL; |
| 601 | } |
| 602 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 603 | /* If anyone is waiting for a QH to become idle, wake them up */ |
| 604 | if (uhci->num_waiting) |
| 605 | wake_up_all(&uhci->waitqh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | } |
| 607 | |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 608 | /* |
| 609 | * Find the highest existing bandwidth load for a given phase and period. |
| 610 | */ |
| 611 | static int uhci_highest_load(struct uhci_hcd *uhci, int phase, int period) |
| 612 | { |
| 613 | int highest_load = uhci->load[phase]; |
| 614 | |
| 615 | for (phase += period; phase < MAX_PHASE; phase += period) |
| 616 | highest_load = max_t(int, highest_load, uhci->load[phase]); |
| 617 | return highest_load; |
| 618 | } |
| 619 | |
| 620 | /* |
| 621 | * Set qh->phase to the optimal phase for a periodic transfer and |
| 622 | * check whether the bandwidth requirement is acceptable. |
| 623 | */ |
| 624 | static int uhci_check_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 625 | { |
| 626 | int minimax_load; |
| 627 | |
| 628 | /* Find the optimal phase (unless it is already set) and get |
| 629 | * its load value. */ |
| 630 | if (qh->phase >= 0) |
| 631 | minimax_load = uhci_highest_load(uhci, qh->phase, qh->period); |
| 632 | else { |
| 633 | int phase, load; |
| 634 | int max_phase = min_t(int, MAX_PHASE, qh->period); |
| 635 | |
| 636 | qh->phase = 0; |
| 637 | minimax_load = uhci_highest_load(uhci, qh->phase, qh->period); |
| 638 | for (phase = 1; phase < max_phase; ++phase) { |
| 639 | load = uhci_highest_load(uhci, phase, qh->period); |
| 640 | if (load < minimax_load) { |
| 641 | minimax_load = load; |
| 642 | qh->phase = phase; |
| 643 | } |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | /* Maximum allowable periodic bandwidth is 90%, or 900 us per frame */ |
| 648 | if (minimax_load + qh->load > 900) { |
| 649 | dev_dbg(uhci_dev(uhci), "bandwidth allocation failed: " |
| 650 | "period %d, phase %d, %d + %d us\n", |
| 651 | qh->period, qh->phase, minimax_load, qh->load); |
| 652 | return -ENOSPC; |
| 653 | } |
| 654 | return 0; |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * Reserve a periodic QH's bandwidth in the schedule |
| 659 | */ |
| 660 | static void uhci_reserve_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 661 | { |
| 662 | int i; |
| 663 | int load = qh->load; |
| 664 | char *p = "??"; |
| 665 | |
| 666 | for (i = qh->phase; i < MAX_PHASE; i += qh->period) { |
| 667 | uhci->load[i] += load; |
| 668 | uhci->total_load += load; |
| 669 | } |
| 670 | uhci_to_hcd(uhci)->self.bandwidth_allocated = |
| 671 | uhci->total_load / MAX_PHASE; |
| 672 | switch (qh->type) { |
| 673 | case USB_ENDPOINT_XFER_INT: |
| 674 | ++uhci_to_hcd(uhci)->self.bandwidth_int_reqs; |
| 675 | p = "INT"; |
| 676 | break; |
| 677 | case USB_ENDPOINT_XFER_ISOC: |
| 678 | ++uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs; |
| 679 | p = "ISO"; |
| 680 | break; |
| 681 | } |
| 682 | qh->bandwidth_reserved = 1; |
| 683 | dev_dbg(uhci_dev(uhci), |
| 684 | "%s dev %d ep%02x-%s, period %d, phase %d, %d us\n", |
| 685 | "reserve", qh->udev->devnum, |
| 686 | qh->hep->desc.bEndpointAddress, p, |
| 687 | qh->period, qh->phase, load); |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * Release a periodic QH's bandwidth reservation |
| 692 | */ |
| 693 | static void uhci_release_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 694 | { |
| 695 | int i; |
| 696 | int load = qh->load; |
| 697 | char *p = "??"; |
| 698 | |
| 699 | for (i = qh->phase; i < MAX_PHASE; i += qh->period) { |
| 700 | uhci->load[i] -= load; |
| 701 | uhci->total_load -= load; |
| 702 | } |
| 703 | uhci_to_hcd(uhci)->self.bandwidth_allocated = |
| 704 | uhci->total_load / MAX_PHASE; |
| 705 | switch (qh->type) { |
| 706 | case USB_ENDPOINT_XFER_INT: |
| 707 | --uhci_to_hcd(uhci)->self.bandwidth_int_reqs; |
| 708 | p = "INT"; |
| 709 | break; |
| 710 | case USB_ENDPOINT_XFER_ISOC: |
| 711 | --uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs; |
| 712 | p = "ISO"; |
| 713 | break; |
| 714 | } |
| 715 | qh->bandwidth_reserved = 0; |
| 716 | dev_dbg(uhci_dev(uhci), |
| 717 | "%s dev %d ep%02x-%s, period %d, phase %d, %d us\n", |
| 718 | "release", qh->udev->devnum, |
| 719 | qh->hep->desc.bEndpointAddress, p, |
| 720 | qh->period, qh->phase, load); |
| 721 | } |
| 722 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 723 | static inline struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci, |
| 724 | struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | { |
| 726 | struct urb_priv *urbp; |
| 727 | |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 728 | urbp = kmem_cache_zalloc(uhci_up_cachep, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | if (!urbp) |
| 730 | return NULL; |
| 731 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | urbp->urb = urb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | urb->hcpriv = urbp; |
Tobias Ollmann | 16325f1 | 2010-12-09 14:24:27 +0100 | [diff] [blame] | 734 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 735 | INIT_LIST_HEAD(&urbp->node); |
| 736 | INIT_LIST_HEAD(&urbp->td_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | |
| 738 | return urbp; |
| 739 | } |
| 740 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 741 | static void uhci_free_urb_priv(struct uhci_hcd *uhci, |
| 742 | struct urb_priv *urbp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | { |
| 744 | struct uhci_td *td, *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
Arjan van de Ven | 5172046 | 2008-09-20 19:09:37 -0700 | [diff] [blame] | 746 | if (!list_empty(&urbp->node)) |
| 747 | dev_WARN(uhci_dev(uhci), "urb %p still on QH's list!\n", |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 748 | urbp->urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | list_for_each_entry_safe(td, tmp, &urbp->td_list, list) { |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 751 | uhci_remove_td_from_urbp(td); |
| 752 | uhci_free_td(uhci, td); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | } |
| 754 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | kmem_cache_free(uhci_up_cachep, urbp); |
| 756 | } |
| 757 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | /* |
| 759 | * Map status to standard result codes |
| 760 | * |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 761 | * <status> is (td_status(uhci, td) & 0xF60000), a.k.a. |
| 762 | * uhci_status_bits(td_status(uhci, td)). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | * Note: <status> does not include the TD_CTRL_NAK bit. |
| 764 | * <dir_out> is True for output TDs and False for input TDs. |
| 765 | */ |
| 766 | static int uhci_map_status(int status, int dir_out) |
| 767 | { |
| 768 | if (!status) |
| 769 | return 0; |
| 770 | if (status & TD_CTRL_BITSTUFF) /* Bitstuff error */ |
| 771 | return -EPROTO; |
| 772 | if (status & TD_CTRL_CRCTIMEO) { /* CRC/Timeout */ |
| 773 | if (dir_out) |
| 774 | return -EPROTO; |
| 775 | else |
| 776 | return -EILSEQ; |
| 777 | } |
| 778 | if (status & TD_CTRL_BABBLE) /* Babble */ |
| 779 | return -EOVERFLOW; |
| 780 | if (status & TD_CTRL_DBUFERR) /* Buffer error */ |
| 781 | return -ENOSR; |
| 782 | if (status & TD_CTRL_STALLED) /* Stalled */ |
| 783 | return -EPIPE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | return 0; |
| 785 | } |
| 786 | |
| 787 | /* |
| 788 | * Control transfers |
| 789 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 790 | static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, |
| 791 | struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | struct uhci_td *td; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | unsigned long destination, status; |
Kuninori Morimoto | 29cc889 | 2011-08-23 03:12:03 -0700 | [diff] [blame] | 795 | int maxsze = usb_endpoint_maxp(&qh->hep->desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | int len = urb->transfer_buffer_length; |
| 797 | dma_addr_t data = urb->transfer_dma; |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 798 | __hc32 *plink; |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 799 | struct urb_priv *urbp = urb->hcpriv; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 800 | int skel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | |
| 802 | /* The "pipe" thing contains the destination in bits 8--18 */ |
| 803 | destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP; |
| 804 | |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 805 | /* 3 errors, dummy TD remains inactive */ |
| 806 | status = uhci_maxerr(3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | if (urb->dev->speed == USB_SPEED_LOW) |
| 808 | status |= TD_CTRL_LS; |
| 809 | |
| 810 | /* |
| 811 | * Build the TD for the control request setup packet |
| 812 | */ |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 813 | td = qh->dummy_td; |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 814 | uhci_add_td_to_urbp(td, urbp); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 815 | uhci_fill_td(uhci, td, status, destination | uhci_explen(8), |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 816 | urb->setup_dma); |
| 817 | plink = &td->link; |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 818 | status |= TD_CTRL_ACTIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
| 820 | /* |
| 821 | * If direction is "send", change the packet ID from SETUP (0x2D) |
| 822 | * to OUT (0xE1). Else change it from SETUP to IN (0x69) and |
| 823 | * set Short Packet Detect (SPD) for all data packets. |
Alan Stern | e7e7c36 | 2007-07-13 15:46:29 -0400 | [diff] [blame] | 824 | * |
| 825 | * 0-length transfers always get treated as "send". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | */ |
Alan Stern | e7e7c36 | 2007-07-13 15:46:29 -0400 | [diff] [blame] | 827 | if (usb_pipeout(urb->pipe) || len == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | destination ^= (USB_PID_SETUP ^ USB_PID_OUT); |
| 829 | else { |
| 830 | destination ^= (USB_PID_SETUP ^ USB_PID_IN); |
| 831 | status |= TD_CTRL_SPD; |
| 832 | } |
| 833 | |
| 834 | /* |
Alan Stern | 687f5f3 | 2005-11-30 17:16:19 -0500 | [diff] [blame] | 835 | * Build the DATA TDs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | */ |
| 837 | while (len > 0) { |
Alan Stern | e7e7c36 | 2007-07-13 15:46:29 -0400 | [diff] [blame] | 838 | int pktsze = maxsze; |
| 839 | |
| 840 | if (len <= pktsze) { /* The last data packet */ |
| 841 | pktsze = len; |
| 842 | status &= ~TD_CTRL_SPD; |
| 843 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
Alan Stern | 2532178 | 2005-04-25 11:14:31 -0400 | [diff] [blame] | 845 | td = uhci_alloc_td(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | if (!td) |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 847 | goto nomem; |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 848 | *plink = LINK_TO_TD(uhci, td); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | |
| 850 | /* Alternate Data0/1 (start with Data1) */ |
| 851 | destination ^= TD_TOKEN_TOGGLE; |
Tobias Ollmann | 16325f1 | 2010-12-09 14:24:27 +0100 | [diff] [blame] | 852 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 853 | uhci_add_td_to_urbp(td, urbp); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 854 | uhci_fill_td(uhci, td, status, |
| 855 | destination | uhci_explen(pktsze), data); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 856 | plink = &td->link; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | |
| 858 | data += pktsze; |
| 859 | len -= pktsze; |
| 860 | } |
| 861 | |
| 862 | /* |
Tobias Ollmann | 16325f1 | 2010-12-09 14:24:27 +0100 | [diff] [blame] | 863 | * Build the final TD for control status |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | */ |
Alan Stern | 2532178 | 2005-04-25 11:14:31 -0400 | [diff] [blame] | 865 | td = uhci_alloc_td(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | if (!td) |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 867 | goto nomem; |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 868 | *plink = LINK_TO_TD(uhci, td); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
Alan Stern | e7e7c36 | 2007-07-13 15:46:29 -0400 | [diff] [blame] | 870 | /* Change direction for the status transaction */ |
| 871 | destination ^= (USB_PID_IN ^ USB_PID_OUT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | destination |= TD_TOKEN_TOGGLE; /* End in Data1 */ |
| 873 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 874 | uhci_add_td_to_urbp(td, urbp); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 875 | uhci_fill_td(uhci, td, status | TD_CTRL_IOC, |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 876 | destination | uhci_explen(0), 0); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 877 | plink = &td->link; |
| 878 | |
| 879 | /* |
| 880 | * Build the new dummy TD and activate the old one |
| 881 | */ |
| 882 | td = uhci_alloc_td(uhci); |
| 883 | if (!td) |
| 884 | goto nomem; |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 885 | *plink = LINK_TO_TD(uhci, td); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 886 | |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 887 | uhci_fill_td(uhci, td, 0, USB_PID_OUT | uhci_explen(0), 0); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 888 | wmb(); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 889 | qh->dummy_td->status |= cpu_to_hc32(uhci, TD_CTRL_ACTIVE); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 890 | qh->dummy_td = td; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | |
| 892 | /* Low-speed transfers get a different queue, and won't hog the bus. |
| 893 | * Also, some devices enumerate better without FSBR; the easiest way |
| 894 | * to do that is to put URBs on the low-speed queue while the device |
Alan Stern | 630aa3c | 2006-01-23 17:17:21 -0500 | [diff] [blame] | 895 | * isn't in the CONFIGURED state. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | if (urb->dev->speed == USB_SPEED_LOW || |
Alan Stern | 630aa3c | 2006-01-23 17:17:21 -0500 | [diff] [blame] | 897 | urb->dev->state != USB_STATE_CONFIGURED) |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 898 | skel = SKEL_LS_CONTROL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | else { |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 900 | skel = SKEL_FS_CONTROL; |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 901 | uhci_add_fsbr(uhci, urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | } |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 903 | if (qh->state != QH_STATE_ACTIVE) |
| 904 | qh->skel = skel; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 905 | return 0; |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 906 | |
| 907 | nomem: |
| 908 | /* Remove the dummy TD from the td_list so it doesn't get freed */ |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 909 | uhci_remove_td_from_urbp(qh->dummy_td); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 910 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | } |
| 912 | |
| 913 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | * Common submit for bulk and interrupt |
| 915 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 916 | static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, |
| 917 | struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | { |
| 919 | struct uhci_td *td; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | unsigned long destination, status; |
Kuninori Morimoto | 29cc889 | 2011-08-23 03:12:03 -0700 | [diff] [blame] | 921 | int maxsze = usb_endpoint_maxp(&qh->hep->desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | int len = urb->transfer_buffer_length; |
Ming Lei | 689d6ea | 2010-09-30 20:32:44 +0800 | [diff] [blame] | 923 | int this_sg_len; |
| 924 | dma_addr_t data; |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 925 | __hc32 *plink; |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 926 | struct urb_priv *urbp = urb->hcpriv; |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 927 | unsigned int toggle; |
Ming Lei | 689d6ea | 2010-09-30 20:32:44 +0800 | [diff] [blame] | 928 | struct scatterlist *sg; |
| 929 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
| 931 | if (len < 0) |
| 932 | return -EINVAL; |
| 933 | |
| 934 | /* The "pipe" thing contains the destination in bits 8--18 */ |
| 935 | destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 936 | toggle = usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), |
| 937 | usb_pipeout(urb->pipe)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 939 | /* 3 errors, dummy TD remains inactive */ |
| 940 | status = uhci_maxerr(3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | if (urb->dev->speed == USB_SPEED_LOW) |
| 942 | status |= TD_CTRL_LS; |
| 943 | if (usb_pipein(urb->pipe)) |
| 944 | status |= TD_CTRL_SPD; |
| 945 | |
Clemens Ladisch | bc677d5 | 2011-12-03 23:41:31 +0100 | [diff] [blame] | 946 | i = urb->num_mapped_sgs; |
Ming Lei | 689d6ea | 2010-09-30 20:32:44 +0800 | [diff] [blame] | 947 | if (len > 0 && i > 0) { |
| 948 | sg = urb->sg; |
| 949 | data = sg_dma_address(sg); |
| 950 | |
| 951 | /* urb->transfer_buffer_length may be smaller than the |
| 952 | * size of the scatterlist (or vice versa) |
| 953 | */ |
| 954 | this_sg_len = min_t(int, sg_dma_len(sg), len); |
| 955 | } else { |
| 956 | sg = NULL; |
| 957 | data = urb->transfer_dma; |
| 958 | this_sg_len = len; |
| 959 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | /* |
Alan Stern | 687f5f3 | 2005-11-30 17:16:19 -0500 | [diff] [blame] | 961 | * Build the DATA TDs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | */ |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 963 | plink = NULL; |
| 964 | td = qh->dummy_td; |
Ming Lei | 689d6ea | 2010-09-30 20:32:44 +0800 | [diff] [blame] | 965 | for (;;) { /* Allow zero length packets */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | int pktsze = maxsze; |
| 967 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 968 | if (len <= pktsze) { /* The last packet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | pktsze = len; |
| 970 | if (!(urb->transfer_flags & URB_SHORT_NOT_OK)) |
| 971 | status &= ~TD_CTRL_SPD; |
| 972 | } |
| 973 | |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 974 | if (plink) { |
| 975 | td = uhci_alloc_td(uhci); |
| 976 | if (!td) |
| 977 | goto nomem; |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 978 | *plink = LINK_TO_TD(uhci, td); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 979 | } |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 980 | uhci_add_td_to_urbp(td, urbp); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 981 | uhci_fill_td(uhci, td, status, |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 982 | destination | uhci_explen(pktsze) | |
| 983 | (toggle << TD_TOKEN_TOGGLE_SHIFT), |
| 984 | data); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 985 | plink = &td->link; |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 986 | status |= TD_CTRL_ACTIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 988 | toggle ^= 1; |
Ming Lei | 689d6ea | 2010-09-30 20:32:44 +0800 | [diff] [blame] | 989 | data += pktsze; |
| 990 | this_sg_len -= pktsze; |
| 991 | len -= maxsze; |
| 992 | if (this_sg_len <= 0) { |
| 993 | if (--i <= 0 || len <= 0) |
| 994 | break; |
| 995 | sg = sg_next(sg); |
| 996 | data = sg_dma_address(sg); |
| 997 | this_sg_len = min_t(int, sg_dma_len(sg), len); |
| 998 | } |
| 999 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | |
| 1001 | /* |
| 1002 | * URB_ZERO_PACKET means adding a 0-length packet, if direction |
| 1003 | * is OUT and the transfer_length was an exact multiple of maxsze, |
| 1004 | * hence (len = transfer_length - N * maxsze) == 0 |
| 1005 | * however, if transfer_length == 0, the zero packet was already |
| 1006 | * prepared above. |
| 1007 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1008 | if ((urb->transfer_flags & URB_ZERO_PACKET) && |
| 1009 | usb_pipeout(urb->pipe) && len == 0 && |
| 1010 | urb->transfer_buffer_length > 0) { |
Alan Stern | 2532178 | 2005-04-25 11:14:31 -0400 | [diff] [blame] | 1011 | td = uhci_alloc_td(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | if (!td) |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1013 | goto nomem; |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1014 | *plink = LINK_TO_TD(uhci, td); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 1016 | uhci_add_td_to_urbp(td, urbp); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1017 | uhci_fill_td(uhci, td, status, |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1018 | destination | uhci_explen(0) | |
| 1019 | (toggle << TD_TOKEN_TOGGLE_SHIFT), |
| 1020 | data); |
| 1021 | plink = &td->link; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1023 | toggle ^= 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | } |
| 1025 | |
| 1026 | /* Set the interrupt-on-completion flag on the last packet. |
| 1027 | * A more-or-less typical 4 KB URB (= size of one memory page) |
| 1028 | * will require about 3 ms to transfer; that's a little on the |
| 1029 | * fast side but not enough to justify delaying an interrupt |
| 1030 | * more than 2 or 3 URBs, so we will ignore the URB_NO_INTERRUPT |
| 1031 | * flag setting. */ |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1032 | td->status |= cpu_to_hc32(uhci, TD_CTRL_IOC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1034 | /* |
| 1035 | * Build the new dummy TD and activate the old one |
| 1036 | */ |
| 1037 | td = uhci_alloc_td(uhci); |
| 1038 | if (!td) |
| 1039 | goto nomem; |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1040 | *plink = LINK_TO_TD(uhci, td); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1041 | |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1042 | uhci_fill_td(uhci, td, 0, USB_PID_OUT | uhci_explen(0), 0); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1043 | wmb(); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1044 | qh->dummy_td->status |= cpu_to_hc32(uhci, TD_CTRL_ACTIVE); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1045 | qh->dummy_td = td; |
| 1046 | |
| 1047 | usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), |
| 1048 | usb_pipeout(urb->pipe), toggle); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1049 | return 0; |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1050 | |
| 1051 | nomem: |
| 1052 | /* Remove the dummy TD from the td_list so it doesn't get freed */ |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 1053 | uhci_remove_td_from_urbp(qh->dummy_td); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1054 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | } |
| 1056 | |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 1057 | static int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb, |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1058 | struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | { |
| 1060 | int ret; |
| 1061 | |
| 1062 | /* Can't have low-speed bulk transfers */ |
| 1063 | if (urb->dev->speed == USB_SPEED_LOW) |
| 1064 | return -EINVAL; |
| 1065 | |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 1066 | if (qh->state != QH_STATE_ACTIVE) |
| 1067 | qh->skel = SKEL_BULK; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1068 | ret = uhci_submit_common(uhci, urb, qh); |
| 1069 | if (ret == 0) |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1070 | uhci_add_fsbr(uhci, urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | return ret; |
| 1072 | } |
| 1073 | |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1074 | static int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb, |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1075 | struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | { |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1077 | int ret; |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1078 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1079 | /* USB 1.1 interrupt transfers only involve one packet per interval. |
| 1080 | * Drivers can submit URBs of any length, but longer ones will need |
| 1081 | * multiple intervals to complete. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | */ |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1083 | |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1084 | if (!qh->bandwidth_reserved) { |
| 1085 | int exponent; |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1086 | |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1087 | /* Figure out which power-of-two queue to use */ |
| 1088 | for (exponent = 7; exponent >= 0; --exponent) { |
| 1089 | if ((1 << exponent) <= urb->interval) |
| 1090 | break; |
| 1091 | } |
| 1092 | if (exponent < 0) |
| 1093 | return -EINVAL; |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1094 | |
Alan Stern | e58dceb | 2008-09-25 16:59:57 -0400 | [diff] [blame] | 1095 | /* If the slot is full, try a lower period */ |
| 1096 | do { |
| 1097 | qh->period = 1 << exponent; |
| 1098 | qh->skel = SKEL_INDEX(exponent); |
| 1099 | |
| 1100 | /* For now, interrupt phase is fixed by the layout |
| 1101 | * of the QH lists. |
| 1102 | */ |
| 1103 | qh->phase = (qh->period / 2) & (MAX_PHASE - 1); |
| 1104 | ret = uhci_check_bandwidth(uhci, qh); |
| 1105 | } while (ret != 0 && --exponent >= 0); |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1106 | if (ret) |
| 1107 | return ret; |
| 1108 | } else if (qh->period > urb->interval) |
| 1109 | return -EINVAL; /* Can't decrease the period */ |
| 1110 | |
| 1111 | ret = uhci_submit_common(uhci, urb, qh); |
| 1112 | if (ret == 0) { |
| 1113 | urb->interval = qh->period; |
| 1114 | if (!qh->bandwidth_reserved) |
| 1115 | uhci_reserve_bandwidth(uhci, qh); |
| 1116 | } |
| 1117 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | } |
| 1119 | |
| 1120 | /* |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1121 | * Fix up the data structures following a short transfer |
| 1122 | */ |
| 1123 | static int uhci_fixup_short_transfer(struct uhci_hcd *uhci, |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1124 | struct uhci_qh *qh, struct urb_priv *urbp) |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1125 | { |
| 1126 | struct uhci_td *td; |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1127 | struct list_head *tmp; |
| 1128 | int ret; |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1129 | |
| 1130 | td = list_entry(urbp->td_list.prev, struct uhci_td, list); |
| 1131 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) { |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1132 | |
| 1133 | /* When a control transfer is short, we have to restart |
| 1134 | * the queue at the status stage transaction, which is |
| 1135 | * the last TD. */ |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1136 | WARN_ON(list_empty(&urbp->td_list)); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1137 | qh->element = LINK_TO_TD(uhci, td); |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1138 | tmp = td->list.prev; |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1139 | ret = -EINPROGRESS; |
| 1140 | |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1141 | } else { |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1142 | |
| 1143 | /* When a bulk/interrupt transfer is short, we have to |
| 1144 | * fix up the toggles of the following URBs on the queue |
| 1145 | * before restarting the queue at the next URB. */ |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1146 | qh->initial_toggle = |
| 1147 | uhci_toggle(td_token(uhci, qh->post_td)) ^ 1; |
| 1148 | uhci_fixup_toggles(uhci, qh, 1); |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1149 | |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1150 | if (list_empty(&urbp->td_list)) |
| 1151 | td = qh->post_td; |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1152 | qh->element = td->link; |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1153 | tmp = urbp->td_list.prev; |
| 1154 | ret = 0; |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1155 | } |
| 1156 | |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1157 | /* Remove all the TDs we skipped over, from tmp back to the start */ |
| 1158 | while (tmp != &urbp->td_list) { |
| 1159 | td = list_entry(tmp, struct uhci_td, list); |
| 1160 | tmp = tmp->prev; |
| 1161 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 1162 | uhci_remove_td_from_urbp(td); |
| 1163 | uhci_free_td(uhci, td); |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1164 | } |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1165 | return ret; |
| 1166 | } |
| 1167 | |
| 1168 | /* |
| 1169 | * Common result for control, bulk, and interrupt |
| 1170 | */ |
| 1171 | static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb) |
| 1172 | { |
| 1173 | struct urb_priv *urbp = urb->hcpriv; |
| 1174 | struct uhci_qh *qh = urbp->qh; |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1175 | struct uhci_td *td, *tmp; |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1176 | unsigned status; |
| 1177 | int ret = 0; |
| 1178 | |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1179 | list_for_each_entry_safe(td, tmp, &urbp->td_list, list) { |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1180 | unsigned int ctrlstat; |
| 1181 | int len; |
| 1182 | |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1183 | ctrlstat = td_status(uhci, td); |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1184 | status = uhci_status_bits(ctrlstat); |
| 1185 | if (status & TD_CTRL_ACTIVE) |
| 1186 | return -EINPROGRESS; |
| 1187 | |
| 1188 | len = uhci_actual_length(ctrlstat); |
| 1189 | urb->actual_length += len; |
| 1190 | |
| 1191 | if (status) { |
| 1192 | ret = uhci_map_status(status, |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1193 | uhci_packetout(td_token(uhci, td))); |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1194 | if ((debug == 1 && ret != -EPIPE) || debug > 1) { |
| 1195 | /* Some debugging code */ |
David Brownell | be3cbc5 | 2006-06-05 12:16:39 -0400 | [diff] [blame] | 1196 | dev_dbg(&urb->dev->dev, |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1197 | "%s: failed with status %x\n", |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 1198 | __func__, status); |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1199 | |
| 1200 | if (debug > 1 && errbuf) { |
| 1201 | /* Print the chain for debugging */ |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 1202 | uhci_show_qh(uhci, urbp->qh, errbuf, |
Chen Gang | 13996ca | 2013-01-23 16:13:41 +0800 | [diff] [blame] | 1203 | ERRBUF_LEN - EXTRA_SPACE, 0); |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1204 | lprintk(errbuf); |
| 1205 | } |
| 1206 | } |
| 1207 | |
Alan Stern | e7e7c36 | 2007-07-13 15:46:29 -0400 | [diff] [blame] | 1208 | /* Did we receive a short packet? */ |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1209 | } else if (len < uhci_expected_length(td_token(uhci, td))) { |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1210 | |
Alan Stern | e7e7c36 | 2007-07-13 15:46:29 -0400 | [diff] [blame] | 1211 | /* For control transfers, go to the status TD if |
| 1212 | * this isn't already the last data TD */ |
| 1213 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) { |
| 1214 | if (td->list.next != urbp->td_list.prev) |
| 1215 | ret = 1; |
| 1216 | } |
| 1217 | |
| 1218 | /* For bulk and interrupt, this may be an error */ |
| 1219 | else if (urb->transfer_flags & URB_SHORT_NOT_OK) |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1220 | ret = -EREMOTEIO; |
Alan Stern | f443ddf | 2006-07-31 10:16:24 -0400 | [diff] [blame] | 1221 | |
| 1222 | /* Fixup needed only if this isn't the URB's last TD */ |
| 1223 | else if (&td->list != urbp->td_list.prev) |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1224 | ret = 1; |
| 1225 | } |
| 1226 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 1227 | uhci_remove_td_from_urbp(td); |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1228 | if (qh->post_td) |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 1229 | uhci_free_td(uhci, qh->post_td); |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1230 | qh->post_td = td; |
| 1231 | |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1232 | if (ret != 0) |
| 1233 | goto err; |
| 1234 | } |
| 1235 | return ret; |
| 1236 | |
| 1237 | err: |
| 1238 | if (ret < 0) { |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1239 | /* Note that the queue has stopped and save |
| 1240 | * the next toggle value */ |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1241 | qh->element = UHCI_PTR_TERM(uhci); |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1242 | qh->is_stopped = 1; |
| 1243 | qh->needs_fixup = (qh->type != USB_ENDPOINT_XFER_CONTROL); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1244 | qh->initial_toggle = uhci_toggle(td_token(uhci, td)) ^ |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1245 | (ret == -EREMOTEIO); |
| 1246 | |
| 1247 | } else /* Short packet received */ |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1248 | ret = uhci_fixup_short_transfer(uhci, qh, urbp); |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1249 | return ret; |
| 1250 | } |
| 1251 | |
| 1252 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | * Isochronous transfers |
| 1254 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1255 | static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb, |
| 1256 | struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1258 | struct uhci_td *td = NULL; /* Since urb->number_of_packets > 0 */ |
Alan Stern | c44b225 | 2012-10-01 10:32:09 -0400 | [diff] [blame] | 1259 | int i; |
| 1260 | unsigned frame, next; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1261 | unsigned long destination, status; |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 1262 | struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1264 | /* Values must not be too big (could overflow below) */ |
| 1265 | if (urb->interval >= UHCI_NUMFRAMES || |
| 1266 | urb->number_of_packets >= UHCI_NUMFRAMES) |
| 1267 | return -EFBIG; |
| 1268 | |
Alan Stern | c44b225 | 2012-10-01 10:32:09 -0400 | [diff] [blame] | 1269 | uhci_get_current_frame_number(uhci); |
| 1270 | |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1271 | /* Check the period and figure out the starting frame number */ |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1272 | if (!qh->bandwidth_reserved) { |
| 1273 | qh->period = urb->interval; |
Alan Stern | c44b225 | 2012-10-01 10:32:09 -0400 | [diff] [blame] | 1274 | qh->phase = -1; /* Find the best phase */ |
| 1275 | i = uhci_check_bandwidth(uhci, qh); |
| 1276 | if (i) |
| 1277 | return i; |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1278 | |
Alan Stern | c44b225 | 2012-10-01 10:32:09 -0400 | [diff] [blame] | 1279 | /* Allow a little time to allocate the TDs */ |
| 1280 | next = uhci->frame_number + 10; |
| 1281 | frame = qh->phase; |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1282 | |
Alan Stern | c44b225 | 2012-10-01 10:32:09 -0400 | [diff] [blame] | 1283 | /* Round up to the first available slot */ |
| 1284 | frame += (next - frame + qh->period - 1) & -qh->period; |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1285 | |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1286 | } else if (qh->period != urb->interval) { |
| 1287 | return -EINVAL; /* Can't change the period */ |
| 1288 | |
Alan Stern | 7898ffc | 2007-10-16 11:55:30 -0400 | [diff] [blame] | 1289 | } else { |
Alan Stern | e1944017 | 2013-05-14 13:57:19 -0400 | [diff] [blame] | 1290 | next = uhci->frame_number + 1; |
Alan Stern | c44b225 | 2012-10-01 10:32:09 -0400 | [diff] [blame] | 1291 | |
Alan Stern | 7898ffc | 2007-10-16 11:55:30 -0400 | [diff] [blame] | 1292 | /* Find the next unused frame */ |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1293 | if (list_empty(&qh->queue)) { |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1294 | frame = qh->iso_frame; |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1295 | } else { |
| 1296 | struct urb *lurb; |
| 1297 | |
| 1298 | lurb = list_entry(qh->queue.prev, |
| 1299 | struct urb_priv, node)->urb; |
| 1300 | frame = lurb->start_frame + |
| 1301 | lurb->number_of_packets * |
| 1302 | lurb->interval; |
| 1303 | } |
Alan Stern | c44b225 | 2012-10-01 10:32:09 -0400 | [diff] [blame] | 1304 | |
| 1305 | /* Fell behind? */ |
Alan Stern | bef073b | 2013-09-24 15:47:20 -0400 | [diff] [blame] | 1306 | if (!uhci_frame_before_eq(next, frame)) { |
Alan Stern | c44b225 | 2012-10-01 10:32:09 -0400 | [diff] [blame] | 1307 | |
| 1308 | /* USB_ISO_ASAP: Round up to the first available slot */ |
| 1309 | if (urb->transfer_flags & URB_ISO_ASAP) |
| 1310 | frame += (next - frame + qh->period - 1) & |
| 1311 | -qh->period; |
| 1312 | |
| 1313 | /* |
Alan Stern | bef073b | 2013-09-24 15:47:20 -0400 | [diff] [blame] | 1314 | * Not ASAP: Use the next slot in the stream, |
| 1315 | * no matter what. |
Alan Stern | 7898ffc | 2007-10-16 11:55:30 -0400 | [diff] [blame] | 1316 | */ |
Alan Stern | c44b225 | 2012-10-01 10:32:09 -0400 | [diff] [blame] | 1317 | else if (!uhci_frame_before_eq(next, |
| 1318 | frame + (urb->number_of_packets - 1) * |
| 1319 | qh->period)) |
Alan Stern | bef073b | 2013-09-24 15:47:20 -0400 | [diff] [blame] | 1320 | dev_dbg(uhci_dev(uhci), "iso underrun %p (%u+%u < %u)\n", |
| 1321 | urb, frame, |
| 1322 | (urb->number_of_packets - 1) * |
| 1323 | qh->period, |
| 1324 | next); |
Alan Stern | c44b225 | 2012-10-01 10:32:09 -0400 | [diff] [blame] | 1325 | } |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1326 | } |
| 1327 | |
| 1328 | /* Make sure we won't have to go too far into the future */ |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1329 | if (uhci_frame_before_eq(uhci->last_iso_frame + UHCI_NUMFRAMES, |
Alan Stern | c44b225 | 2012-10-01 10:32:09 -0400 | [diff] [blame] | 1330 | frame + urb->number_of_packets * urb->interval)) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1331 | return -EFBIG; |
Alan Stern | c44b225 | 2012-10-01 10:32:09 -0400 | [diff] [blame] | 1332 | urb->start_frame = frame; |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1333 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1334 | status = TD_CTRL_ACTIVE | TD_CTRL_IOS; |
| 1335 | destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe); |
| 1336 | |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 1337 | for (i = 0; i < urb->number_of_packets; i++) { |
Alan Stern | 2532178 | 2005-04-25 11:14:31 -0400 | [diff] [blame] | 1338 | td = uhci_alloc_td(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | if (!td) |
| 1340 | return -ENOMEM; |
| 1341 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 1342 | uhci_add_td_to_urbp(td, urbp); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1343 | uhci_fill_td(uhci, td, status, destination | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1344 | uhci_explen(urb->iso_frame_desc[i].length), |
| 1345 | urb->transfer_dma + |
| 1346 | urb->iso_frame_desc[i].offset); |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 1347 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1349 | /* Set the interrupt-on-completion flag on the last packet. */ |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1350 | td->status |= cpu_to_hc32(uhci, TD_CTRL_IOC); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1351 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1352 | /* Add the TDs to the frame list */ |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 1353 | frame = urb->start_frame; |
| 1354 | list_for_each_entry(td, &urbp->td_list, list) { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1355 | uhci_insert_td_in_frame_list(uhci, td, frame); |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1356 | frame += qh->period; |
| 1357 | } |
| 1358 | |
| 1359 | if (list_empty(&qh->queue)) { |
| 1360 | qh->iso_packet_desc = &urb->iso_frame_desc[0]; |
| 1361 | qh->iso_frame = urb->start_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | } |
| 1363 | |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 1364 | qh->skel = SKEL_ISO; |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1365 | if (!qh->bandwidth_reserved) |
| 1366 | uhci_reserve_bandwidth(uhci, qh); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1367 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | } |
| 1369 | |
| 1370 | static int uhci_result_isochronous(struct uhci_hcd *uhci, struct urb *urb) |
| 1371 | { |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1372 | struct uhci_td *td, *tmp; |
| 1373 | struct urb_priv *urbp = urb->hcpriv; |
| 1374 | struct uhci_qh *qh = urbp->qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1376 | list_for_each_entry_safe(td, tmp, &urbp->td_list, list) { |
| 1377 | unsigned int ctrlstat; |
| 1378 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | int actlength; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1381 | if (uhci_frame_before_eq(uhci->cur_iso_frame, qh->iso_frame)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | return -EINPROGRESS; |
| 1383 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1384 | uhci_remove_tds_from_frame(uhci, qh->iso_frame); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1386 | ctrlstat = td_status(uhci, td); |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1387 | if (ctrlstat & TD_CTRL_ACTIVE) { |
| 1388 | status = -EXDEV; /* TD was added too late? */ |
| 1389 | } else { |
| 1390 | status = uhci_map_status(uhci_status_bits(ctrlstat), |
| 1391 | usb_pipeout(urb->pipe)); |
| 1392 | actlength = uhci_actual_length(ctrlstat); |
| 1393 | |
| 1394 | urb->actual_length += actlength; |
| 1395 | qh->iso_packet_desc->actual_length = actlength; |
| 1396 | qh->iso_packet_desc->status = status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | } |
Alan Stern | ee7d1f3 | 2007-08-21 15:37:50 -0400 | [diff] [blame] | 1398 | if (status) |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1399 | urb->error_count++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1401 | uhci_remove_td_from_urbp(td); |
| 1402 | uhci_free_td(uhci, td); |
| 1403 | qh->iso_frame += qh->period; |
| 1404 | ++qh->iso_packet_desc; |
| 1405 | } |
Alan Stern | ee7d1f3 | 2007-08-21 15:37:50 -0400 | [diff] [blame] | 1406 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | } |
| 1408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | static int uhci_urb_enqueue(struct usb_hcd *hcd, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1410 | struct urb *urb, gfp_t mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | { |
| 1412 | int ret; |
| 1413 | struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| 1414 | unsigned long flags; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1415 | struct urb_priv *urbp; |
| 1416 | struct uhci_qh *qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | |
| 1418 | spin_lock_irqsave(&uhci->lock, flags); |
| 1419 | |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1420 | ret = usb_hcd_link_urb_to_ep(hcd, urb); |
| 1421 | if (ret) |
| 1422 | goto done_not_linked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1424 | ret = -ENOMEM; |
| 1425 | urbp = uhci_alloc_urb_priv(uhci, urb); |
| 1426 | if (!urbp) |
| 1427 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1429 | if (urb->ep->hcpriv) |
| 1430 | qh = urb->ep->hcpriv; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1431 | else { |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1432 | qh = uhci_alloc_qh(uhci, urb->dev, urb->ep); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1433 | if (!qh) |
| 1434 | goto err_no_qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | } |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1436 | urbp->qh = qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | |
Alan Stern | 4de7d2c | 2006-05-05 16:26:58 -0400 | [diff] [blame] | 1438 | switch (qh->type) { |
| 1439 | case USB_ENDPOINT_XFER_CONTROL: |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1440 | ret = uhci_submit_control(uhci, urb, qh); |
| 1441 | break; |
Alan Stern | 4de7d2c | 2006-05-05 16:26:58 -0400 | [diff] [blame] | 1442 | case USB_ENDPOINT_XFER_BULK: |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1443 | ret = uhci_submit_bulk(uhci, urb, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | break; |
Alan Stern | 4de7d2c | 2006-05-05 16:26:58 -0400 | [diff] [blame] | 1445 | case USB_ENDPOINT_XFER_INT: |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1446 | ret = uhci_submit_interrupt(uhci, urb, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | break; |
Alan Stern | 4de7d2c | 2006-05-05 16:26:58 -0400 | [diff] [blame] | 1448 | case USB_ENDPOINT_XFER_ISOC: |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1449 | urb->error_count = 0; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1450 | ret = uhci_submit_isochronous(uhci, urb, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | break; |
| 1452 | } |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1453 | if (ret != 0) |
| 1454 | goto err_submit_failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1456 | /* Add this URB to the QH */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1457 | list_add_tail(&urbp->node, &qh->queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1459 | /* If the new URB is the first and only one on this QH then either |
| 1460 | * the QH is new and idle or else it's unlinked and waiting to |
Alan Stern | 2775562 | 2006-05-05 16:32:02 -0400 | [diff] [blame] | 1461 | * become idle, so we can activate it right away. But only if the |
| 1462 | * queue isn't stopped. */ |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1463 | if (qh->queue.next == &urbp->node && !qh->is_stopped) { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1464 | uhci_activate_qh(uhci, qh); |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1465 | uhci_urbp_wants_fsbr(uhci, urbp); |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1466 | } |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1467 | goto done; |
| 1468 | |
| 1469 | err_submit_failed: |
| 1470 | if (qh->state == QH_STATE_IDLE) |
| 1471 | uhci_make_qh_idle(uhci, qh); /* Reclaim unused QH */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1472 | err_no_qh: |
| 1473 | uhci_free_urb_priv(uhci, urbp); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1474 | done: |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1475 | if (ret) |
| 1476 | usb_hcd_unlink_urb_from_ep(hcd, urb); |
| 1477 | done_not_linked: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | spin_unlock_irqrestore(&uhci->lock, flags); |
| 1479 | return ret; |
| 1480 | } |
| 1481 | |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1482 | static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | { |
| 1484 | struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| 1485 | unsigned long flags; |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 1486 | struct uhci_qh *qh; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1487 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | |
| 1489 | spin_lock_irqsave(&uhci->lock, flags); |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1490 | rc = usb_hcd_check_unlink_urb(hcd, urb, status); |
| 1491 | if (rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | goto done; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1493 | |
| 1494 | qh = ((struct urb_priv *) urb->hcpriv)->qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1496 | /* Remove Isochronous TDs from the frame list ASAP */ |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 1497 | if (qh->type == USB_ENDPOINT_XFER_ISOC) { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1498 | uhci_unlink_isochronous_tds(uhci, urb); |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 1499 | mb(); |
| 1500 | |
| 1501 | /* If the URB has already started, update the QH unlink time */ |
| 1502 | uhci_get_current_frame_number(uhci); |
| 1503 | if (uhci_frame_before_eq(urb->start_frame, uhci->frame_number)) |
| 1504 | qh->unlink_frame = uhci->frame_number; |
| 1505 | } |
| 1506 | |
| 1507 | uhci_unlink_qh(uhci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | |
| 1509 | done: |
| 1510 | spin_unlock_irqrestore(&uhci->lock, flags); |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1511 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | } |
| 1513 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1514 | /* |
| 1515 | * Finish unlinking an URB and give it back |
| 1516 | */ |
| 1517 | static void uhci_giveback_urb(struct uhci_hcd *uhci, struct uhci_qh *qh, |
Alan Stern | 4a00027 | 2007-08-24 15:42:24 -0400 | [diff] [blame] | 1518 | struct urb *urb, int status) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1519 | __releases(uhci->lock) |
| 1520 | __acquires(uhci->lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | { |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1522 | struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | |
Alan Stern | e7e7c36 | 2007-07-13 15:46:29 -0400 | [diff] [blame] | 1524 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) { |
| 1525 | |
Alan Stern | 7ea0a2b | 2009-03-05 11:01:11 -0500 | [diff] [blame] | 1526 | /* Subtract off the length of the SETUP packet from |
| 1527 | * urb->actual_length. |
| 1528 | */ |
| 1529 | urb->actual_length -= min_t(u32, 8, urb->actual_length); |
Alan Stern | e7e7c36 | 2007-07-13 15:46:29 -0400 | [diff] [blame] | 1530 | } |
| 1531 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1532 | /* When giving back the first URB in an Isochronous queue, |
| 1533 | * reinitialize the QH's iso-related members for the next URB. */ |
Alan Stern | e7e7c36 | 2007-07-13 15:46:29 -0400 | [diff] [blame] | 1534 | else if (qh->type == USB_ENDPOINT_XFER_ISOC && |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1535 | urbp->node.prev == &qh->queue && |
| 1536 | urbp->node.next != &qh->queue) { |
| 1537 | struct urb *nurb = list_entry(urbp->node.next, |
| 1538 | struct urb_priv, node)->urb; |
| 1539 | |
| 1540 | qh->iso_packet_desc = &nurb->iso_frame_desc[0]; |
| 1541 | qh->iso_frame = nurb->start_frame; |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1542 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1544 | /* Take the URB off the QH's queue. If the queue is now empty, |
| 1545 | * this is a perfect time for a toggle fixup. */ |
| 1546 | list_del_init(&urbp->node); |
| 1547 | if (list_empty(&qh->queue) && qh->needs_fixup) { |
| 1548 | usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), |
| 1549 | usb_pipeout(urb->pipe), qh->initial_toggle); |
| 1550 | qh->needs_fixup = 0; |
| 1551 | } |
| 1552 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1553 | uhci_free_urb_priv(uhci, urbp); |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1554 | usb_hcd_unlink_urb_from_ep(uhci_to_hcd(uhci), urb); |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1555 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1556 | spin_unlock(&uhci->lock); |
Alan Stern | 4a00027 | 2007-08-24 15:42:24 -0400 | [diff] [blame] | 1557 | usb_hcd_giveback_urb(uhci_to_hcd(uhci), urb, status); |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1558 | spin_lock(&uhci->lock); |
| 1559 | |
| 1560 | /* If the queue is now empty, we can unlink the QH and give up its |
| 1561 | * reserved bandwidth. */ |
| 1562 | if (list_empty(&qh->queue)) { |
| 1563 | uhci_unlink_qh(uhci, qh); |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1564 | if (qh->bandwidth_reserved) |
| 1565 | uhci_release_bandwidth(uhci, qh); |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1566 | } |
| 1567 | } |
| 1568 | |
| 1569 | /* |
| 1570 | * Scan the URBs in a QH's queue |
| 1571 | */ |
| 1572 | #define QH_FINISHED_UNLINKING(qh) \ |
| 1573 | (qh->state == QH_STATE_UNLINKING && \ |
| 1574 | uhci->frame_number + uhci->is_stopped != qh->unlink_frame) |
| 1575 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1576 | static void uhci_scan_qh(struct uhci_hcd *uhci, struct uhci_qh *qh) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1577 | { |
| 1578 | struct urb_priv *urbp; |
| 1579 | struct urb *urb; |
| 1580 | int status; |
| 1581 | |
| 1582 | while (!list_empty(&qh->queue)) { |
| 1583 | urbp = list_entry(qh->queue.next, struct urb_priv, node); |
| 1584 | urb = urbp->urb; |
| 1585 | |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1586 | if (qh->type == USB_ENDPOINT_XFER_ISOC) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1587 | status = uhci_result_isochronous(uhci, urb); |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1588 | else |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1589 | status = uhci_result_common(uhci, urb); |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1590 | if (status == -EINPROGRESS) |
| 1591 | break; |
| 1592 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1593 | /* Dequeued but completed URBs can't be given back unless |
| 1594 | * the QH is stopped or has finished unlinking. */ |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 1595 | if (urb->unlinked) { |
Alan Stern | 2775562 | 2006-05-05 16:32:02 -0400 | [diff] [blame] | 1596 | if (QH_FINISHED_UNLINKING(qh)) |
| 1597 | qh->is_stopped = 1; |
| 1598 | else if (!qh->is_stopped) |
| 1599 | return; |
| 1600 | } |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1601 | |
Alan Stern | 4a00027 | 2007-08-24 15:42:24 -0400 | [diff] [blame] | 1602 | uhci_giveback_urb(uhci, qh, urb, status); |
Alan Stern | ee7d1f3 | 2007-08-21 15:37:50 -0400 | [diff] [blame] | 1603 | if (status < 0) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1604 | break; |
| 1605 | } |
| 1606 | |
| 1607 | /* If the QH is neither stopped nor finished unlinking (normal case), |
| 1608 | * our work here is done. */ |
Alan Stern | 2775562 | 2006-05-05 16:32:02 -0400 | [diff] [blame] | 1609 | if (QH_FINISHED_UNLINKING(qh)) |
| 1610 | qh->is_stopped = 1; |
| 1611 | else if (!qh->is_stopped) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1612 | return; |
| 1613 | |
| 1614 | /* Otherwise give back each of the dequeued URBs */ |
Alan Stern | 2775562 | 2006-05-05 16:32:02 -0400 | [diff] [blame] | 1615 | restart: |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1616 | list_for_each_entry(urbp, &qh->queue, node) { |
| 1617 | urb = urbp->urb; |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 1618 | if (urb->unlinked) { |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 1619 | |
| 1620 | /* Fix up the TD links and save the toggles for |
| 1621 | * non-Isochronous queues. For Isochronous queues, |
| 1622 | * test for too-recent dequeues. */ |
| 1623 | if (!uhci_cleanup_queue(uhci, qh, urb)) { |
| 1624 | qh->is_stopped = 0; |
| 1625 | return; |
| 1626 | } |
Alan Stern | 4a00027 | 2007-08-24 15:42:24 -0400 | [diff] [blame] | 1627 | uhci_giveback_urb(uhci, qh, urb, 0); |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1628 | goto restart; |
| 1629 | } |
| 1630 | } |
| 1631 | qh->is_stopped = 0; |
| 1632 | |
| 1633 | /* There are no more dequeued URBs. If there are still URBs on the |
| 1634 | * queue, the QH can now be re-activated. */ |
| 1635 | if (!list_empty(&qh->queue)) { |
| 1636 | if (qh->needs_fixup) |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1637 | uhci_fixup_toggles(uhci, qh, 0); |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1638 | |
| 1639 | /* If the first URB on the queue wants FSBR but its time |
| 1640 | * limit has expired, set the next TD to interrupt on |
| 1641 | * completion before reactivating the QH. */ |
| 1642 | urbp = list_entry(qh->queue.next, struct urb_priv, node); |
| 1643 | if (urbp->fsbr && qh->wait_expired) { |
| 1644 | struct uhci_td *td = list_entry(urbp->td_list.next, |
| 1645 | struct uhci_td, list); |
| 1646 | |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1647 | td->status |= cpu_to_hc32(uhci, TD_CTRL_IOC); |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1648 | } |
| 1649 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1650 | uhci_activate_qh(uhci, qh); |
| 1651 | } |
| 1652 | |
| 1653 | /* The queue is empty. The QH can become idle if it is fully |
| 1654 | * unlinked. */ |
| 1655 | else if (QH_FINISHED_UNLINKING(qh)) |
| 1656 | uhci_make_qh_idle(uhci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | } |
| 1658 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1659 | /* |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1660 | * Check for queues that have made some forward progress. |
| 1661 | * Returns 0 if the queue is not Isochronous, is ACTIVE, and |
| 1662 | * has not advanced since last examined; 1 otherwise. |
Alan Stern | b761d9d | 2006-05-12 11:41:59 -0400 | [diff] [blame] | 1663 | * |
| 1664 | * Early Intel controllers have a bug which causes qh->element sometimes |
| 1665 | * not to advance when a TD completes successfully. The queue remains |
| 1666 | * stuck on the inactive completed TD. We detect such cases and advance |
| 1667 | * the element pointer by hand. |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1668 | */ |
| 1669 | static int uhci_advance_check(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 1670 | { |
| 1671 | struct urb_priv *urbp = NULL; |
| 1672 | struct uhci_td *td; |
| 1673 | int ret = 1; |
| 1674 | unsigned status; |
| 1675 | |
| 1676 | if (qh->type == USB_ENDPOINT_XFER_ISOC) |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1677 | goto done; |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1678 | |
| 1679 | /* Treat an UNLINKING queue as though it hasn't advanced. |
| 1680 | * This is okay because reactivation will treat it as though |
| 1681 | * it has advanced, and if it is going to become IDLE then |
| 1682 | * this doesn't matter anyway. Furthermore it's possible |
| 1683 | * for an UNLINKING queue not to have any URBs at all, or |
| 1684 | * for its first URB not to have any TDs (if it was dequeued |
| 1685 | * just as it completed). So it's not easy in any case to |
| 1686 | * test whether such queues have advanced. */ |
| 1687 | if (qh->state != QH_STATE_ACTIVE) { |
| 1688 | urbp = NULL; |
| 1689 | status = 0; |
| 1690 | |
| 1691 | } else { |
| 1692 | urbp = list_entry(qh->queue.next, struct urb_priv, node); |
| 1693 | td = list_entry(urbp->td_list.next, struct uhci_td, list); |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1694 | status = td_status(uhci, td); |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1695 | if (!(status & TD_CTRL_ACTIVE)) { |
| 1696 | |
| 1697 | /* We're okay, the queue has advanced */ |
| 1698 | qh->wait_expired = 0; |
| 1699 | qh->advance_jiffies = jiffies; |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1700 | goto done; |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1701 | } |
Alan Stern | ba297ed | 2010-06-09 17:34:39 -0400 | [diff] [blame] | 1702 | ret = uhci->is_stopped; |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1703 | } |
| 1704 | |
| 1705 | /* The queue hasn't advanced; check for timeout */ |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1706 | if (qh->wait_expired) |
| 1707 | goto done; |
| 1708 | |
| 1709 | if (time_after(jiffies, qh->advance_jiffies + QH_WAIT_TIMEOUT)) { |
Alan Stern | b761d9d | 2006-05-12 11:41:59 -0400 | [diff] [blame] | 1710 | |
| 1711 | /* Detect the Intel bug and work around it */ |
Jan Andersson | 51e2f62 | 2011-05-18 10:44:51 +0200 | [diff] [blame] | 1712 | if (qh->post_td && qh_element(qh) == |
| 1713 | LINK_TO_TD(uhci, qh->post_td)) { |
Alan Stern | b761d9d | 2006-05-12 11:41:59 -0400 | [diff] [blame] | 1714 | qh->element = qh->post_td->link; |
| 1715 | qh->advance_jiffies = jiffies; |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1716 | ret = 1; |
| 1717 | goto done; |
Alan Stern | b761d9d | 2006-05-12 11:41:59 -0400 | [diff] [blame] | 1718 | } |
| 1719 | |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1720 | qh->wait_expired = 1; |
| 1721 | |
| 1722 | /* If the current URB wants FSBR, unlink it temporarily |
| 1723 | * so that we can safely set the next TD to interrupt on |
| 1724 | * completion. That way we'll know as soon as the queue |
| 1725 | * starts moving again. */ |
| 1726 | if (urbp && urbp->fsbr && !(status & TD_CTRL_IOC)) |
| 1727 | uhci_unlink_qh(uhci, qh); |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1728 | |
| 1729 | } else { |
| 1730 | /* Unmoving but not-yet-expired queues keep FSBR alive */ |
| 1731 | if (urbp) |
| 1732 | uhci_urbp_wants_fsbr(uhci, urbp); |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1733 | } |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1734 | |
| 1735 | done: |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1736 | return ret; |
| 1737 | } |
| 1738 | |
| 1739 | /* |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1740 | * Process events in the schedule, but only in one thread at a time |
| 1741 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1742 | static void uhci_scan_schedule(struct uhci_hcd *uhci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | { |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1744 | int i; |
| 1745 | struct uhci_qh *qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | |
| 1747 | /* Don't allow re-entrant calls */ |
| 1748 | if (uhci->scan_in_progress) { |
| 1749 | uhci->need_rescan = 1; |
| 1750 | return; |
| 1751 | } |
| 1752 | uhci->scan_in_progress = 1; |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1753 | rescan: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | uhci->need_rescan = 0; |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1755 | uhci->fsbr_is_wanted = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | |
Alan Stern | 6c1b445 | 2005-04-21 16:04:58 -0400 | [diff] [blame] | 1757 | uhci_clear_next_interrupt(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | uhci_get_current_frame_number(uhci); |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1759 | uhci->cur_iso_frame = uhci->frame_number; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1761 | /* Go through all the QH queues and process the URBs in each one */ |
| 1762 | for (i = 0; i < UHCI_NUM_SKELQH - 1; ++i) { |
| 1763 | uhci->next_qh = list_entry(uhci->skelqh[i]->node.next, |
| 1764 | struct uhci_qh, node); |
| 1765 | while ((qh = uhci->next_qh) != uhci->skelqh[i]) { |
| 1766 | uhci->next_qh = list_entry(qh->node.next, |
| 1767 | struct uhci_qh, node); |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1768 | |
| 1769 | if (uhci_advance_check(uhci, qh)) { |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1770 | uhci_scan_qh(uhci, qh); |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1771 | if (qh->state == QH_STATE_ACTIVE) { |
| 1772 | uhci_urbp_wants_fsbr(uhci, |
| 1773 | list_entry(qh->queue.next, struct urb_priv, node)); |
| 1774 | } |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1775 | } |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1776 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1778 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1779 | uhci->last_iso_frame = uhci->cur_iso_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | if (uhci->need_rescan) |
| 1781 | goto rescan; |
| 1782 | uhci->scan_in_progress = 0; |
| 1783 | |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1784 | if (uhci->fsbr_is_on && !uhci->fsbr_is_wanted && |
| 1785 | !uhci->fsbr_expiring) { |
| 1786 | uhci->fsbr_expiring = 1; |
| 1787 | mod_timer(&uhci->fsbr_timer, jiffies + FSBR_OFF_DELAY); |
| 1788 | } |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1789 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 1790 | if (list_empty(&uhci->skel_unlink_qh->node)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1791 | uhci_clear_next_interrupt(uhci); |
| 1792 | else |
| 1793 | uhci_set_next_interrupt(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | } |