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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | uhci->term_td->status |= cpu_to_le32(TD_CTRL_IOC); |
| 33 | } |
| 34 | |
| 35 | static inline void uhci_clear_next_interrupt(struct uhci_hcd *uhci) |
| 36 | { |
| 37 | uhci->term_td->status &= ~cpu_to_le32(TD_CTRL_IOC); |
| 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); |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 56 | lqh->link = LINK_TO_QH(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); |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 68 | lqh->link = UHCI_PTR_TERM; |
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 | { |
| 126 | if (!list_empty(&td->list)) |
| 127 | dev_warn(uhci_dev(uhci), "td %p still in list!\n", td); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 128 | if (!list_empty(&td->fl_list)) |
| 129 | dev_warn(uhci_dev(uhci), "td %p still in fl_list!\n", td); |
| 130 | |
| 131 | dma_pool_free(uhci->td_pool, td, td->dma_handle); |
| 132 | } |
| 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | static inline void uhci_fill_td(struct uhci_td *td, u32 status, |
| 135 | u32 token, u32 buffer) |
| 136 | { |
| 137 | td->status = cpu_to_le32(status); |
| 138 | td->token = cpu_to_le32(token); |
| 139 | td->buffer = cpu_to_le32(buffer); |
| 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(); |
Alan Stern | 28b9325 | 2007-02-19 15:51:51 -0500 | [diff] [blame] | 173 | ltd->link = LINK_TO_TD(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(); |
Alan Stern | 28b9325 | 2007-02-19 15:51:51 -0500 | [diff] [blame] | 177 | uhci->frame[framenum] = LINK_TO_TD(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 | |
| 198 | ntd = list_entry(td->fl_list.next, struct uhci_td, fl_list); |
Alan Stern | 28b9325 | 2007-02-19 15:51:51 -0500 | [diff] [blame] | 199 | uhci->frame[td->frame] = LINK_TO_TD(ntd); |
Alan Stern | a1d59ce | 2005-09-16 14:22:51 -0400 | [diff] [blame] | 200 | uhci->frame_cpu[td->frame] = ntd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } |
| 202 | } else { |
| 203 | struct uhci_td *ptd; |
| 204 | |
| 205 | ptd = list_entry(td->fl_list.prev, struct uhci_td, fl_list); |
| 206 | ptd->link = td->link; |
| 207 | } |
| 208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | list_del_init(&td->fl_list); |
| 210 | td->frame = -1; |
| 211 | } |
| 212 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 213 | static inline void uhci_remove_tds_from_frame(struct uhci_hcd *uhci, |
| 214 | unsigned int framenum) |
| 215 | { |
| 216 | struct uhci_td *ftd, *ltd; |
| 217 | |
| 218 | framenum &= (UHCI_NUMFRAMES - 1); |
| 219 | |
| 220 | ftd = uhci->frame_cpu[framenum]; |
| 221 | if (ftd) { |
| 222 | ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list); |
| 223 | uhci->frame[framenum] = ltd->link; |
| 224 | uhci->frame_cpu[framenum] = NULL; |
| 225 | |
| 226 | while (!list_empty(&ftd->fl_list)) |
| 227 | list_del_init(ftd->fl_list.prev); |
| 228 | } |
| 229 | } |
| 230 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 231 | /* |
| 232 | * Remove all the TDs for an Isochronous URB from the frame list |
| 233 | */ |
| 234 | 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] | 235 | { |
| 236 | struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv; |
| 237 | struct uhci_td *td; |
| 238 | |
| 239 | list_for_each_entry(td, &urbp->td_list, list) |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 240 | uhci_remove_td_from_frame_list(uhci, td); |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 241 | } |
| 242 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 243 | static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci, |
| 244 | struct usb_device *udev, struct usb_host_endpoint *hep) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | { |
| 246 | dma_addr_t dma_handle; |
| 247 | struct uhci_qh *qh; |
| 248 | |
| 249 | qh = dma_pool_alloc(uhci->qh_pool, GFP_ATOMIC, &dma_handle); |
| 250 | if (!qh) |
| 251 | return NULL; |
| 252 | |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 253 | memset(qh, 0, sizeof(*qh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | qh->dma_handle = dma_handle; |
| 255 | |
| 256 | qh->element = UHCI_PTR_TERM; |
| 257 | qh->link = UHCI_PTR_TERM; |
| 258 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 259 | INIT_LIST_HEAD(&qh->queue); |
| 260 | INIT_LIST_HEAD(&qh->node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 262 | if (udev) { /* Normal QH */ |
Alan Stern | 85a975d | 2007-01-08 12:01:43 -0500 | [diff] [blame] | 263 | qh->type = hep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; |
| 264 | if (qh->type != USB_ENDPOINT_XFER_ISOC) { |
| 265 | qh->dummy_td = uhci_alloc_td(uhci); |
| 266 | if (!qh->dummy_td) { |
| 267 | dma_pool_free(uhci->qh_pool, qh, dma_handle); |
| 268 | return NULL; |
| 269 | } |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 270 | } |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 271 | qh->state = QH_STATE_IDLE; |
| 272 | qh->hep = hep; |
| 273 | qh->udev = udev; |
| 274 | hep->hcpriv = qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 276 | if (qh->type == USB_ENDPOINT_XFER_INT || |
| 277 | qh->type == USB_ENDPOINT_XFER_ISOC) |
| 278 | qh->load = usb_calc_bus_time(udev->speed, |
| 279 | usb_endpoint_dir_in(&hep->desc), |
| 280 | qh->type == USB_ENDPOINT_XFER_ISOC, |
| 281 | le16_to_cpu(hep->desc.wMaxPacketSize)) |
| 282 | / 1000 + 1; |
| 283 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 284 | } else { /* Skeleton QH */ |
| 285 | qh->state = QH_STATE_ACTIVE; |
Alan Stern | 4de7d2c | 2006-05-05 16:26:58 -0400 | [diff] [blame] | 286 | qh->type = -1; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 287 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | return qh; |
| 289 | } |
| 290 | |
| 291 | static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 292 | { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 293 | WARN_ON(qh->state != QH_STATE_IDLE && qh->udev); |
| 294 | if (!list_empty(&qh->queue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | dev_warn(uhci_dev(uhci), "qh %p list not empty!\n", qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 297 | list_del(&qh->node); |
| 298 | if (qh->udev) { |
| 299 | qh->hep->hcpriv = NULL; |
Alan Stern | 85a975d | 2007-01-08 12:01:43 -0500 | [diff] [blame] | 300 | if (qh->dummy_td) |
| 301 | uhci_free_td(uhci, qh->dummy_td); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 302 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | dma_pool_free(uhci->qh_pool, qh, qh->dma_handle); |
| 304 | } |
| 305 | |
| 306 | /* |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 307 | * When a queue is stopped and a dequeued URB is given back, adjust |
| 308 | * the previous TD link (if the URB isn't first on the queue) or |
| 309 | * save its toggle value (if it is first and is currently executing). |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 310 | * |
| 311 | * 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] | 312 | */ |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 313 | 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] | 314 | struct urb *urb) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 315 | { |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 316 | struct urb_priv *urbp = urb->hcpriv; |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 317 | struct uhci_td *td; |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 318 | int ret = 1; |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 319 | |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 320 | /* Isochronous pipes don't use toggles and their TD link pointers |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 321 | * get adjusted during uhci_urb_dequeue(). But since their queues |
| 322 | * cannot truly be stopped, we have to watch out for dequeues |
| 323 | * occurring after the nominal unlink frame. */ |
| 324 | if (qh->type == USB_ENDPOINT_XFER_ISOC) { |
| 325 | ret = (uhci->frame_number + uhci->is_stopped != |
| 326 | qh->unlink_frame); |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 327 | goto done; |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 328 | } |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 329 | |
| 330 | /* If the URB isn't first on its queue, adjust the link pointer |
| 331 | * of the last TD in the previous URB. The toggle doesn't need |
| 332 | * to be saved since this URB can't be executing yet. */ |
| 333 | if (qh->queue.next != &urbp->node) { |
| 334 | struct urb_priv *purbp; |
| 335 | struct uhci_td *ptd; |
| 336 | |
| 337 | purbp = list_entry(urbp->node.prev, struct urb_priv, node); |
| 338 | WARN_ON(list_empty(&purbp->td_list)); |
| 339 | ptd = list_entry(purbp->td_list.prev, struct uhci_td, |
| 340 | list); |
| 341 | td = list_entry(urbp->td_list.prev, struct uhci_td, |
| 342 | list); |
| 343 | ptd->link = td->link; |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 344 | goto done; |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 345 | } |
| 346 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 347 | /* If the QH element pointer is UHCI_PTR_TERM then then currently |
| 348 | * executing URB has already been unlinked, so this one isn't it. */ |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 349 | if (qh_element(qh) == UHCI_PTR_TERM) |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 350 | goto done; |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 351 | qh->element = UHCI_PTR_TERM; |
| 352 | |
Alan Stern | 85a975d | 2007-01-08 12:01:43 -0500 | [diff] [blame] | 353 | /* Control pipes don't have to worry about toggles */ |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 354 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 355 | goto done; |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 356 | |
Alan Stern | a0b458b | 2006-05-12 11:23:19 -0400 | [diff] [blame] | 357 | /* Save the next toggle value */ |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 358 | WARN_ON(list_empty(&urbp->td_list)); |
| 359 | td = list_entry(urbp->td_list.next, struct uhci_td, list); |
| 360 | qh->needs_fixup = 1; |
| 361 | qh->initial_toggle = uhci_toggle(td_token(td)); |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 362 | |
| 363 | done: |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 364 | return ret; |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 365 | } |
| 366 | |
| 367 | /* |
| 368 | * Fix up the data toggles for URBs in a queue, when one of them |
| 369 | * terminates early (short transfer, error, or dequeued). |
| 370 | */ |
| 371 | static void uhci_fixup_toggles(struct uhci_qh *qh, int skip_first) |
| 372 | { |
| 373 | struct urb_priv *urbp = NULL; |
| 374 | struct uhci_td *td; |
| 375 | unsigned int toggle = qh->initial_toggle; |
| 376 | unsigned int pipe; |
| 377 | |
| 378 | /* Fixups for a short transfer start with the second URB in the |
| 379 | * queue (the short URB is the first). */ |
| 380 | if (skip_first) |
| 381 | urbp = list_entry(qh->queue.next, struct urb_priv, node); |
| 382 | |
| 383 | /* When starting with the first URB, if the QH element pointer is |
| 384 | * still valid then we know the URB's toggles are okay. */ |
| 385 | else if (qh_element(qh) != UHCI_PTR_TERM) |
| 386 | toggle = 2; |
| 387 | |
| 388 | /* Fix up the toggle for the URBs in the queue. Normally this |
| 389 | * loop won't run more than once: When an error or short transfer |
| 390 | * occurs, the queue usually gets emptied. */ |
Alan Stern | 1393adb | 2006-01-31 10:02:55 -0500 | [diff] [blame] | 391 | urbp = list_prepare_entry(urbp, &qh->queue, node); |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 392 | list_for_each_entry_continue(urbp, &qh->queue, node) { |
| 393 | |
| 394 | /* If the first TD has the right toggle value, we don't |
| 395 | * need to change any toggles in this URB */ |
| 396 | td = list_entry(urbp->td_list.next, struct uhci_td, list); |
| 397 | if (toggle > 1 || uhci_toggle(td_token(td)) == toggle) { |
Alan Stern | db59b46 | 2006-08-31 14:18:39 -0400 | [diff] [blame] | 398 | td = list_entry(urbp->td_list.prev, struct uhci_td, |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 399 | list); |
| 400 | toggle = uhci_toggle(td_token(td)) ^ 1; |
| 401 | |
| 402 | /* Otherwise all the toggles in the URB have to be switched */ |
| 403 | } else { |
| 404 | list_for_each_entry(td, &urbp->td_list, list) { |
| 405 | td->token ^= __constant_cpu_to_le32( |
| 406 | TD_TOKEN_TOGGLE); |
| 407 | toggle ^= 1; |
| 408 | } |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | wmb(); |
| 413 | pipe = list_entry(qh->queue.next, struct urb_priv, node)->urb->pipe; |
| 414 | usb_settoggle(qh->udev, usb_pipeendpoint(pipe), |
| 415 | usb_pipeout(pipe), toggle); |
| 416 | qh->needs_fixup = 0; |
| 417 | } |
| 418 | |
| 419 | /* |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 420 | * Link an Isochronous QH into its skeleton's list |
| 421 | */ |
| 422 | static inline void link_iso(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 423 | { |
| 424 | list_add_tail(&qh->node, &uhci->skel_iso_qh->node); |
| 425 | |
| 426 | /* Isochronous QHs aren't linked by the hardware */ |
| 427 | } |
| 428 | |
| 429 | /* |
| 430 | * Link a high-period interrupt QH into the schedule at the end of its |
| 431 | * skeleton's list |
| 432 | */ |
| 433 | static void link_interrupt(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 434 | { |
| 435 | struct uhci_qh *pqh; |
| 436 | |
| 437 | list_add_tail(&qh->node, &uhci->skelqh[qh->skel]->node); |
| 438 | |
| 439 | pqh = list_entry(qh->node.prev, struct uhci_qh, node); |
| 440 | qh->link = pqh->link; |
| 441 | wmb(); |
| 442 | pqh->link = LINK_TO_QH(qh); |
| 443 | } |
| 444 | |
| 445 | /* |
| 446 | * Link a period-1 interrupt or async QH into the schedule at the |
| 447 | * correct spot in the async skeleton's list, and update the FSBR link |
| 448 | */ |
| 449 | static void link_async(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 450 | { |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 451 | struct uhci_qh *pqh; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 452 | __le32 link_to_new_qh; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 453 | |
| 454 | /* Find the predecessor QH for our new one and insert it in the list. |
| 455 | * The list of QHs is expected to be short, so linear search won't |
| 456 | * take too long. */ |
| 457 | list_for_each_entry_reverse(pqh, &uhci->skel_async_qh->node, node) { |
| 458 | if (pqh->skel <= qh->skel) |
| 459 | break; |
| 460 | } |
| 461 | list_add(&qh->node, &pqh->node); |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 462 | |
| 463 | /* Link it into the schedule */ |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 464 | qh->link = pqh->link; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 465 | wmb(); |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 466 | link_to_new_qh = LINK_TO_QH(qh); |
| 467 | pqh->link = link_to_new_qh; |
| 468 | |
| 469 | /* If this is now the first FSBR QH, link the terminating skeleton |
| 470 | * QH to it. */ |
| 471 | if (pqh->skel < SKEL_FSBR && qh->skel >= SKEL_FSBR) |
| 472 | uhci->skel_term_qh->link = link_to_new_qh; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | /* |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 476 | * Put a QH on the schedule in both hardware and software |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 478 | 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] | 479 | { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 480 | WARN_ON(list_empty(&qh->queue)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 482 | /* Set the element pointer if it isn't set already. |
| 483 | * This isn't needed for Isochronous queues, but it doesn't hurt. */ |
| 484 | if (qh_element(qh) == UHCI_PTR_TERM) { |
| 485 | struct urb_priv *urbp = list_entry(qh->queue.next, |
| 486 | struct urb_priv, node); |
| 487 | struct uhci_td *td = list_entry(urbp->td_list.next, |
| 488 | struct uhci_td, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
Alan Stern | 28b9325 | 2007-02-19 15:51:51 -0500 | [diff] [blame] | 490 | qh->element = LINK_TO_TD(td); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | } |
| 492 | |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 493 | /* Treat the queue as if it has just advanced */ |
| 494 | qh->wait_expired = 0; |
| 495 | qh->advance_jiffies = jiffies; |
| 496 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 497 | if (qh->state == QH_STATE_ACTIVE) |
| 498 | return; |
| 499 | qh->state = QH_STATE_ACTIVE; |
| 500 | |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 501 | /* 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] | 502 | * skeleton's list */ |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 503 | if (qh == uhci->next_qh) |
| 504 | uhci->next_qh = list_entry(qh->node.next, struct uhci_qh, |
| 505 | node); |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 506 | list_del(&qh->node); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 507 | |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 508 | if (qh->skel == SKEL_ISO) |
| 509 | link_iso(uhci, qh); |
| 510 | else if (qh->skel < SKEL_ASYNC) |
| 511 | link_interrupt(uhci, qh); |
| 512 | else |
| 513 | link_async(uhci, qh); |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * Unlink a high-period interrupt QH from the schedule |
| 518 | */ |
| 519 | static void unlink_interrupt(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 520 | { |
| 521 | struct uhci_qh *pqh; |
| 522 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 523 | pqh = list_entry(qh->node.prev, struct uhci_qh, node); |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 524 | pqh->link = qh->link; |
| 525 | mb(); |
| 526 | } |
| 527 | |
| 528 | /* |
| 529 | * Unlink a period-1 interrupt or async QH from the schedule |
| 530 | */ |
| 531 | static void unlink_async(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 532 | { |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 533 | struct uhci_qh *pqh; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 534 | __le32 link_to_next_qh = qh->link; |
| 535 | |
| 536 | pqh = list_entry(qh->node.prev, struct uhci_qh, node); |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 537 | pqh->link = link_to_next_qh; |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 538 | |
| 539 | /* If this was the old first FSBR QH, link the terminating skeleton |
| 540 | * QH to the next (new first FSBR) QH. */ |
| 541 | if (pqh->skel < SKEL_FSBR && qh->skel >= SKEL_FSBR) |
| 542 | uhci->skel_term_qh->link = link_to_next_qh; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 543 | mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | } |
| 545 | |
| 546 | /* |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 547 | * Take a QH off the hardware schedule |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 549 | 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] | 550 | { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 551 | if (qh->state == QH_STATE_UNLINKING) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | return; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 553 | WARN_ON(qh->state != QH_STATE_ACTIVE || !qh->udev); |
| 554 | qh->state = QH_STATE_UNLINKING; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 556 | /* Unlink the QH from the schedule and record when we did it */ |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 557 | if (qh->skel == SKEL_ISO) |
| 558 | ; |
| 559 | else if (qh->skel < SKEL_ASYNC) |
| 560 | unlink_interrupt(uhci, qh); |
| 561 | else |
| 562 | unlink_async(uhci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | |
| 564 | uhci_get_current_frame_number(uhci); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 565 | qh->unlink_frame = uhci->frame_number; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 567 | /* Force an interrupt so we know when the QH is fully unlinked */ |
| 568 | if (list_empty(&uhci->skel_unlink_qh->node)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | uhci_set_next_interrupt(uhci); |
| 570 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 571 | /* 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] | 572 | if (qh == uhci->next_qh) |
| 573 | uhci->next_qh = list_entry(qh->node.next, struct uhci_qh, |
| 574 | node); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 575 | list_move_tail(&qh->node, &uhci->skel_unlink_qh->node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | } |
| 577 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 578 | /* |
| 579 | * When we and the controller are through with a QH, it becomes IDLE. |
| 580 | * This happens when a QH has been off the schedule (on the unlinking |
| 581 | * list) for more than one frame, or when an error occurs while adding |
| 582 | * the first URB onto a new QH. |
| 583 | */ |
| 584 | 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] | 585 | { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 586 | WARN_ON(qh->state == QH_STATE_ACTIVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 588 | if (qh == uhci->next_qh) |
| 589 | uhci->next_qh = list_entry(qh->node.next, struct uhci_qh, |
| 590 | node); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 591 | list_move(&qh->node, &uhci->idle_qh_list); |
| 592 | qh->state = QH_STATE_IDLE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 594 | /* Now that the QH is idle, its post_td isn't being used */ |
| 595 | if (qh->post_td) { |
| 596 | uhci_free_td(uhci, qh->post_td); |
| 597 | qh->post_td = NULL; |
| 598 | } |
| 599 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 600 | /* If anyone is waiting for a QH to become idle, wake them up */ |
| 601 | if (uhci->num_waiting) |
| 602 | wake_up_all(&uhci->waitqh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | } |
| 604 | |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 605 | /* |
| 606 | * Find the highest existing bandwidth load for a given phase and period. |
| 607 | */ |
| 608 | static int uhci_highest_load(struct uhci_hcd *uhci, int phase, int period) |
| 609 | { |
| 610 | int highest_load = uhci->load[phase]; |
| 611 | |
| 612 | for (phase += period; phase < MAX_PHASE; phase += period) |
| 613 | highest_load = max_t(int, highest_load, uhci->load[phase]); |
| 614 | return highest_load; |
| 615 | } |
| 616 | |
| 617 | /* |
| 618 | * Set qh->phase to the optimal phase for a periodic transfer and |
| 619 | * check whether the bandwidth requirement is acceptable. |
| 620 | */ |
| 621 | static int uhci_check_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 622 | { |
| 623 | int minimax_load; |
| 624 | |
| 625 | /* Find the optimal phase (unless it is already set) and get |
| 626 | * its load value. */ |
| 627 | if (qh->phase >= 0) |
| 628 | minimax_load = uhci_highest_load(uhci, qh->phase, qh->period); |
| 629 | else { |
| 630 | int phase, load; |
| 631 | int max_phase = min_t(int, MAX_PHASE, qh->period); |
| 632 | |
| 633 | qh->phase = 0; |
| 634 | minimax_load = uhci_highest_load(uhci, qh->phase, qh->period); |
| 635 | for (phase = 1; phase < max_phase; ++phase) { |
| 636 | load = uhci_highest_load(uhci, phase, qh->period); |
| 637 | if (load < minimax_load) { |
| 638 | minimax_load = load; |
| 639 | qh->phase = phase; |
| 640 | } |
| 641 | } |
| 642 | } |
| 643 | |
| 644 | /* Maximum allowable periodic bandwidth is 90%, or 900 us per frame */ |
| 645 | if (minimax_load + qh->load > 900) { |
| 646 | dev_dbg(uhci_dev(uhci), "bandwidth allocation failed: " |
| 647 | "period %d, phase %d, %d + %d us\n", |
| 648 | qh->period, qh->phase, minimax_load, qh->load); |
| 649 | return -ENOSPC; |
| 650 | } |
| 651 | return 0; |
| 652 | } |
| 653 | |
| 654 | /* |
| 655 | * Reserve a periodic QH's bandwidth in the schedule |
| 656 | */ |
| 657 | static void uhci_reserve_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 658 | { |
| 659 | int i; |
| 660 | int load = qh->load; |
| 661 | char *p = "??"; |
| 662 | |
| 663 | for (i = qh->phase; i < MAX_PHASE; i += qh->period) { |
| 664 | uhci->load[i] += load; |
| 665 | uhci->total_load += load; |
| 666 | } |
| 667 | uhci_to_hcd(uhci)->self.bandwidth_allocated = |
| 668 | uhci->total_load / MAX_PHASE; |
| 669 | switch (qh->type) { |
| 670 | case USB_ENDPOINT_XFER_INT: |
| 671 | ++uhci_to_hcd(uhci)->self.bandwidth_int_reqs; |
| 672 | p = "INT"; |
| 673 | break; |
| 674 | case USB_ENDPOINT_XFER_ISOC: |
| 675 | ++uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs; |
| 676 | p = "ISO"; |
| 677 | break; |
| 678 | } |
| 679 | qh->bandwidth_reserved = 1; |
| 680 | dev_dbg(uhci_dev(uhci), |
| 681 | "%s dev %d ep%02x-%s, period %d, phase %d, %d us\n", |
| 682 | "reserve", qh->udev->devnum, |
| 683 | qh->hep->desc.bEndpointAddress, p, |
| 684 | qh->period, qh->phase, load); |
| 685 | } |
| 686 | |
| 687 | /* |
| 688 | * Release a periodic QH's bandwidth reservation |
| 689 | */ |
| 690 | static void uhci_release_bandwidth(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 691 | { |
| 692 | int i; |
| 693 | int load = qh->load; |
| 694 | char *p = "??"; |
| 695 | |
| 696 | for (i = qh->phase; i < MAX_PHASE; i += qh->period) { |
| 697 | uhci->load[i] -= load; |
| 698 | uhci->total_load -= load; |
| 699 | } |
| 700 | uhci_to_hcd(uhci)->self.bandwidth_allocated = |
| 701 | uhci->total_load / MAX_PHASE; |
| 702 | switch (qh->type) { |
| 703 | case USB_ENDPOINT_XFER_INT: |
| 704 | --uhci_to_hcd(uhci)->self.bandwidth_int_reqs; |
| 705 | p = "INT"; |
| 706 | break; |
| 707 | case USB_ENDPOINT_XFER_ISOC: |
| 708 | --uhci_to_hcd(uhci)->self.bandwidth_isoc_reqs; |
| 709 | p = "ISO"; |
| 710 | break; |
| 711 | } |
| 712 | qh->bandwidth_reserved = 0; |
| 713 | dev_dbg(uhci_dev(uhci), |
| 714 | "%s dev %d ep%02x-%s, period %d, phase %d, %d us\n", |
| 715 | "release", qh->udev->devnum, |
| 716 | qh->hep->desc.bEndpointAddress, p, |
| 717 | qh->period, qh->phase, load); |
| 718 | } |
| 719 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 720 | static inline struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci, |
| 721 | struct urb *urb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | { |
| 723 | struct urb_priv *urbp; |
| 724 | |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 725 | urbp = kmem_cache_zalloc(uhci_up_cachep, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | if (!urbp) |
| 727 | return NULL; |
| 728 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | urbp->urb = urb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | urb->hcpriv = urbp; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 731 | |
| 732 | INIT_LIST_HEAD(&urbp->node); |
| 733 | INIT_LIST_HEAD(&urbp->td_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
| 735 | return urbp; |
| 736 | } |
| 737 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 738 | static void uhci_free_urb_priv(struct uhci_hcd *uhci, |
| 739 | struct urb_priv *urbp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | { |
| 741 | struct uhci_td *td, *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 743 | if (!list_empty(&urbp->node)) |
| 744 | dev_warn(uhci_dev(uhci), "urb %p still on QH's list!\n", |
| 745 | urbp->urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | list_for_each_entry_safe(td, tmp, &urbp->td_list, list) { |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 748 | uhci_remove_td_from_urbp(td); |
| 749 | uhci_free_td(uhci, td); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | } |
| 751 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 752 | urbp->urb->hcpriv = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | kmem_cache_free(uhci_up_cachep, urbp); |
| 754 | } |
| 755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | /* |
| 757 | * Map status to standard result codes |
| 758 | * |
| 759 | * <status> is (td_status(td) & 0xF60000), a.k.a. |
| 760 | * uhci_status_bits(td_status(td)). |
| 761 | * Note: <status> does not include the TD_CTRL_NAK bit. |
| 762 | * <dir_out> is True for output TDs and False for input TDs. |
| 763 | */ |
| 764 | static int uhci_map_status(int status, int dir_out) |
| 765 | { |
| 766 | if (!status) |
| 767 | return 0; |
| 768 | if (status & TD_CTRL_BITSTUFF) /* Bitstuff error */ |
| 769 | return -EPROTO; |
| 770 | if (status & TD_CTRL_CRCTIMEO) { /* CRC/Timeout */ |
| 771 | if (dir_out) |
| 772 | return -EPROTO; |
| 773 | else |
| 774 | return -EILSEQ; |
| 775 | } |
| 776 | if (status & TD_CTRL_BABBLE) /* Babble */ |
| 777 | return -EOVERFLOW; |
| 778 | if (status & TD_CTRL_DBUFERR) /* Buffer error */ |
| 779 | return -ENOSR; |
| 780 | if (status & TD_CTRL_STALLED) /* Stalled */ |
| 781 | return -EPIPE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | return 0; |
| 783 | } |
| 784 | |
| 785 | /* |
| 786 | * Control transfers |
| 787 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 788 | static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, |
| 789 | struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | struct uhci_td *td; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | unsigned long destination, status; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 793 | int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | int len = urb->transfer_buffer_length; |
| 795 | dma_addr_t data = urb->transfer_dma; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 796 | __le32 *plink; |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 797 | struct urb_priv *urbp = urb->hcpriv; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 798 | int skel; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | |
| 800 | /* The "pipe" thing contains the destination in bits 8--18 */ |
| 801 | destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP; |
| 802 | |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 803 | /* 3 errors, dummy TD remains inactive */ |
| 804 | status = uhci_maxerr(3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | if (urb->dev->speed == USB_SPEED_LOW) |
| 806 | status |= TD_CTRL_LS; |
| 807 | |
| 808 | /* |
| 809 | * Build the TD for the control request setup packet |
| 810 | */ |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 811 | td = qh->dummy_td; |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 812 | uhci_add_td_to_urbp(td, urbp); |
Alan Stern | fa34656 | 2005-11-30 11:57:51 -0500 | [diff] [blame] | 813 | uhci_fill_td(td, status, destination | uhci_explen(8), |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 814 | urb->setup_dma); |
| 815 | plink = &td->link; |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 816 | status |= TD_CTRL_ACTIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | |
| 818 | /* |
| 819 | * If direction is "send", change the packet ID from SETUP (0x2D) |
| 820 | * to OUT (0xE1). Else change it from SETUP to IN (0x69) and |
| 821 | * set Short Packet Detect (SPD) for all data packets. |
| 822 | */ |
| 823 | if (usb_pipeout(urb->pipe)) |
| 824 | destination ^= (USB_PID_SETUP ^ USB_PID_OUT); |
| 825 | else { |
| 826 | destination ^= (USB_PID_SETUP ^ USB_PID_IN); |
| 827 | status |= TD_CTRL_SPD; |
| 828 | } |
| 829 | |
| 830 | /* |
Alan Stern | 687f5f3 | 2005-11-30 17:16:19 -0500 | [diff] [blame] | 831 | * Build the DATA TDs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | */ |
| 833 | while (len > 0) { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 834 | int pktsze = min(len, maxsze); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
Alan Stern | 2532178 | 2005-04-25 11:14:31 -0400 | [diff] [blame] | 836 | td = uhci_alloc_td(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | if (!td) |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 838 | goto nomem; |
Alan Stern | 28b9325 | 2007-02-19 15:51:51 -0500 | [diff] [blame] | 839 | *plink = LINK_TO_TD(td); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | |
| 841 | /* Alternate Data0/1 (start with Data1) */ |
| 842 | destination ^= TD_TOKEN_TOGGLE; |
| 843 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 844 | uhci_add_td_to_urbp(td, urbp); |
Alan Stern | fa34656 | 2005-11-30 11:57:51 -0500 | [diff] [blame] | 845 | uhci_fill_td(td, status, destination | uhci_explen(pktsze), |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 846 | data); |
| 847 | plink = &td->link; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
| 849 | data += pktsze; |
| 850 | len -= pktsze; |
| 851 | } |
| 852 | |
| 853 | /* |
| 854 | * Build the final TD for control status |
| 855 | */ |
Alan Stern | 2532178 | 2005-04-25 11:14:31 -0400 | [diff] [blame] | 856 | td = uhci_alloc_td(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | if (!td) |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 858 | goto nomem; |
Alan Stern | 28b9325 | 2007-02-19 15:51:51 -0500 | [diff] [blame] | 859 | *plink = LINK_TO_TD(td); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
| 861 | /* |
| 862 | * It's IN if the pipe is an output pipe or we're not expecting |
| 863 | * data back. |
| 864 | */ |
| 865 | destination &= ~TD_TOKEN_PID_MASK; |
| 866 | if (usb_pipeout(urb->pipe) || !urb->transfer_buffer_length) |
| 867 | destination |= USB_PID_IN; |
| 868 | else |
| 869 | destination |= USB_PID_OUT; |
| 870 | |
| 871 | destination |= TD_TOKEN_TOGGLE; /* End in Data1 */ |
| 872 | |
| 873 | status &= ~TD_CTRL_SPD; |
| 874 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 875 | uhci_add_td_to_urbp(td, urbp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | uhci_fill_td(td, status | TD_CTRL_IOC, |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 877 | destination | uhci_explen(0), 0); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 878 | plink = &td->link; |
| 879 | |
| 880 | /* |
| 881 | * Build the new dummy TD and activate the old one |
| 882 | */ |
| 883 | td = uhci_alloc_td(uhci); |
| 884 | if (!td) |
| 885 | goto nomem; |
Alan Stern | 28b9325 | 2007-02-19 15:51:51 -0500 | [diff] [blame] | 886 | *plink = LINK_TO_TD(td); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 887 | |
| 888 | uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0); |
| 889 | wmb(); |
| 890 | qh->dummy_td->status |= __constant_cpu_to_le32(TD_CTRL_ACTIVE); |
| 891 | qh->dummy_td = td; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | |
| 893 | /* Low-speed transfers get a different queue, and won't hog the bus. |
| 894 | * Also, some devices enumerate better without FSBR; the easiest way |
| 895 | * 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] | 896 | * isn't in the CONFIGURED state. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | if (urb->dev->speed == USB_SPEED_LOW || |
Alan Stern | 630aa3c | 2006-01-23 17:17:21 -0500 | [diff] [blame] | 898 | urb->dev->state != USB_STATE_CONFIGURED) |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 899 | skel = SKEL_LS_CONTROL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | else { |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 901 | skel = SKEL_FS_CONTROL; |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 902 | uhci_add_fsbr(uhci, urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | } |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 904 | if (qh->state != QH_STATE_ACTIVE) |
| 905 | qh->skel = skel; |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 906 | |
| 907 | urb->actual_length = -8; /* Account for the SETUP packet */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 908 | return 0; |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 909 | |
| 910 | nomem: |
| 911 | /* 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] | 912 | uhci_remove_td_from_urbp(qh->dummy_td); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 913 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | } |
| 915 | |
| 916 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | * Common submit for bulk and interrupt |
| 918 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 919 | static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, |
| 920 | struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | { |
| 922 | struct uhci_td *td; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | unsigned long destination, status; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 924 | int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | int len = urb->transfer_buffer_length; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | dma_addr_t data = urb->transfer_dma; |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 927 | __le32 *plink; |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 928 | struct urb_priv *urbp = urb->hcpriv; |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 929 | unsigned int toggle; |
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 | |
| 946 | /* |
Alan Stern | 687f5f3 | 2005-11-30 17:16:19 -0500 | [diff] [blame] | 947 | * Build the DATA TDs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | */ |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 949 | plink = NULL; |
| 950 | td = qh->dummy_td; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | do { /* Allow zero length packets */ |
| 952 | int pktsze = maxsze; |
| 953 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 954 | if (len <= pktsze) { /* The last packet */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | pktsze = len; |
| 956 | if (!(urb->transfer_flags & URB_SHORT_NOT_OK)) |
| 957 | status &= ~TD_CTRL_SPD; |
| 958 | } |
| 959 | |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 960 | if (plink) { |
| 961 | td = uhci_alloc_td(uhci); |
| 962 | if (!td) |
| 963 | goto nomem; |
Alan Stern | 28b9325 | 2007-02-19 15:51:51 -0500 | [diff] [blame] | 964 | *plink = LINK_TO_TD(td); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 965 | } |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 966 | uhci_add_td_to_urbp(td, urbp); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 967 | uhci_fill_td(td, status, |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 968 | destination | uhci_explen(pktsze) | |
| 969 | (toggle << TD_TOKEN_TOGGLE_SHIFT), |
| 970 | data); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 971 | plink = &td->link; |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 972 | status |= TD_CTRL_ACTIVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
| 974 | data += pktsze; |
| 975 | len -= maxsze; |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 976 | toggle ^= 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | } while (len > 0); |
| 978 | |
| 979 | /* |
| 980 | * URB_ZERO_PACKET means adding a 0-length packet, if direction |
| 981 | * is OUT and the transfer_length was an exact multiple of maxsze, |
| 982 | * hence (len = transfer_length - N * maxsze) == 0 |
| 983 | * however, if transfer_length == 0, the zero packet was already |
| 984 | * prepared above. |
| 985 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 986 | if ((urb->transfer_flags & URB_ZERO_PACKET) && |
| 987 | usb_pipeout(urb->pipe) && len == 0 && |
| 988 | urb->transfer_buffer_length > 0) { |
Alan Stern | 2532178 | 2005-04-25 11:14:31 -0400 | [diff] [blame] | 989 | td = uhci_alloc_td(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | if (!td) |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 991 | goto nomem; |
Alan Stern | 28b9325 | 2007-02-19 15:51:51 -0500 | [diff] [blame] | 992 | *plink = LINK_TO_TD(td); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 994 | uhci_add_td_to_urbp(td, urbp); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 995 | uhci_fill_td(td, status, |
| 996 | destination | uhci_explen(0) | |
| 997 | (toggle << TD_TOKEN_TOGGLE_SHIFT), |
| 998 | data); |
| 999 | plink = &td->link; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1001 | toggle ^= 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | } |
| 1003 | |
| 1004 | /* Set the interrupt-on-completion flag on the last packet. |
| 1005 | * A more-or-less typical 4 KB URB (= size of one memory page) |
| 1006 | * will require about 3 ms to transfer; that's a little on the |
| 1007 | * fast side but not enough to justify delaying an interrupt |
| 1008 | * more than 2 or 3 URBs, so we will ignore the URB_NO_INTERRUPT |
| 1009 | * flag setting. */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1010 | td->status |= __constant_cpu_to_le32(TD_CTRL_IOC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1012 | /* |
| 1013 | * Build the new dummy TD and activate the old one |
| 1014 | */ |
| 1015 | td = uhci_alloc_td(uhci); |
| 1016 | if (!td) |
| 1017 | goto nomem; |
Alan Stern | 28b9325 | 2007-02-19 15:51:51 -0500 | [diff] [blame] | 1018 | *plink = LINK_TO_TD(td); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1019 | |
| 1020 | uhci_fill_td(td, 0, USB_PID_OUT | uhci_explen(0), 0); |
| 1021 | wmb(); |
| 1022 | qh->dummy_td->status |= __constant_cpu_to_le32(TD_CTRL_ACTIVE); |
| 1023 | qh->dummy_td = td; |
| 1024 | |
| 1025 | usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), |
| 1026 | usb_pipeout(urb->pipe), toggle); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1027 | return 0; |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1028 | |
| 1029 | nomem: |
| 1030 | /* 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] | 1031 | uhci_remove_td_from_urbp(qh->dummy_td); |
Alan Stern | af0bb59 | 2005-12-17 18:00:12 -0500 | [diff] [blame] | 1032 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | } |
| 1034 | |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 1035 | static int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb, |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1036 | struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | { |
| 1038 | int ret; |
| 1039 | |
| 1040 | /* Can't have low-speed bulk transfers */ |
| 1041 | if (urb->dev->speed == USB_SPEED_LOW) |
| 1042 | return -EINVAL; |
| 1043 | |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 1044 | if (qh->state != QH_STATE_ACTIVE) |
| 1045 | qh->skel = SKEL_BULK; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1046 | ret = uhci_submit_common(uhci, urb, qh); |
| 1047 | if (ret == 0) |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1048 | uhci_add_fsbr(uhci, urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | return ret; |
| 1050 | } |
| 1051 | |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1052 | static int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb, |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1053 | struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | { |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1055 | int ret; |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1056 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1057 | /* USB 1.1 interrupt transfers only involve one packet per interval. |
| 1058 | * Drivers can submit URBs of any length, but longer ones will need |
| 1059 | * multiple intervals to complete. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | */ |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1061 | |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1062 | if (!qh->bandwidth_reserved) { |
| 1063 | int exponent; |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1064 | |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1065 | /* Figure out which power-of-two queue to use */ |
| 1066 | for (exponent = 7; exponent >= 0; --exponent) { |
| 1067 | if ((1 << exponent) <= urb->interval) |
| 1068 | break; |
| 1069 | } |
| 1070 | if (exponent < 0) |
| 1071 | return -EINVAL; |
| 1072 | qh->period = 1 << exponent; |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 1073 | qh->skel = SKEL_INDEX(exponent); |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1074 | |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1075 | /* For now, interrupt phase is fixed by the layout |
| 1076 | * of the QH lists. */ |
| 1077 | qh->phase = (qh->period / 2) & (MAX_PHASE - 1); |
| 1078 | ret = uhci_check_bandwidth(uhci, qh); |
| 1079 | if (ret) |
| 1080 | return ret; |
| 1081 | } else if (qh->period > urb->interval) |
| 1082 | return -EINVAL; /* Can't decrease the period */ |
| 1083 | |
| 1084 | ret = uhci_submit_common(uhci, urb, qh); |
| 1085 | if (ret == 0) { |
| 1086 | urb->interval = qh->period; |
| 1087 | if (!qh->bandwidth_reserved) |
| 1088 | uhci_reserve_bandwidth(uhci, qh); |
| 1089 | } |
| 1090 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | } |
| 1092 | |
| 1093 | /* |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1094 | * Fix up the data structures following a short transfer |
| 1095 | */ |
| 1096 | static int uhci_fixup_short_transfer(struct uhci_hcd *uhci, |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1097 | struct uhci_qh *qh, struct urb_priv *urbp) |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1098 | { |
| 1099 | struct uhci_td *td; |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1100 | struct list_head *tmp; |
| 1101 | int ret; |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1102 | |
| 1103 | td = list_entry(urbp->td_list.prev, struct uhci_td, list); |
| 1104 | if (qh->type == USB_ENDPOINT_XFER_CONTROL) { |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1105 | |
| 1106 | /* When a control transfer is short, we have to restart |
| 1107 | * the queue at the status stage transaction, which is |
| 1108 | * the last TD. */ |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1109 | WARN_ON(list_empty(&urbp->td_list)); |
Alan Stern | 28b9325 | 2007-02-19 15:51:51 -0500 | [diff] [blame] | 1110 | qh->element = LINK_TO_TD(td); |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1111 | tmp = td->list.prev; |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1112 | ret = -EINPROGRESS; |
| 1113 | |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1114 | } else { |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1115 | |
| 1116 | /* When a bulk/interrupt transfer is short, we have to |
| 1117 | * fix up the toggles of the following URBs on the queue |
| 1118 | * before restarting the queue at the next URB. */ |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1119 | qh->initial_toggle = uhci_toggle(td_token(qh->post_td)) ^ 1; |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1120 | uhci_fixup_toggles(qh, 1); |
| 1121 | |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1122 | if (list_empty(&urbp->td_list)) |
| 1123 | td = qh->post_td; |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1124 | qh->element = td->link; |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1125 | tmp = urbp->td_list.prev; |
| 1126 | ret = 0; |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1127 | } |
| 1128 | |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1129 | /* Remove all the TDs we skipped over, from tmp back to the start */ |
| 1130 | while (tmp != &urbp->td_list) { |
| 1131 | td = list_entry(tmp, struct uhci_td, list); |
| 1132 | tmp = tmp->prev; |
| 1133 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 1134 | uhci_remove_td_from_urbp(td); |
| 1135 | uhci_free_td(uhci, td); |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1136 | } |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1137 | return ret; |
| 1138 | } |
| 1139 | |
| 1140 | /* |
| 1141 | * Common result for control, bulk, and interrupt |
| 1142 | */ |
| 1143 | static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb) |
| 1144 | { |
| 1145 | struct urb_priv *urbp = urb->hcpriv; |
| 1146 | struct uhci_qh *qh = urbp->qh; |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1147 | struct uhci_td *td, *tmp; |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1148 | unsigned status; |
| 1149 | int ret = 0; |
| 1150 | |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1151 | list_for_each_entry_safe(td, tmp, &urbp->td_list, list) { |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1152 | unsigned int ctrlstat; |
| 1153 | int len; |
| 1154 | |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1155 | ctrlstat = td_status(td); |
| 1156 | status = uhci_status_bits(ctrlstat); |
| 1157 | if (status & TD_CTRL_ACTIVE) |
| 1158 | return -EINPROGRESS; |
| 1159 | |
| 1160 | len = uhci_actual_length(ctrlstat); |
| 1161 | urb->actual_length += len; |
| 1162 | |
| 1163 | if (status) { |
| 1164 | ret = uhci_map_status(status, |
| 1165 | uhci_packetout(td_token(td))); |
| 1166 | if ((debug == 1 && ret != -EPIPE) || debug > 1) { |
| 1167 | /* Some debugging code */ |
David Brownell | be3cbc5 | 2006-06-05 12:16:39 -0400 | [diff] [blame] | 1168 | dev_dbg(&urb->dev->dev, |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1169 | "%s: failed with status %x\n", |
| 1170 | __FUNCTION__, status); |
| 1171 | |
| 1172 | if (debug > 1 && errbuf) { |
| 1173 | /* Print the chain for debugging */ |
Alan Stern | e009f1b | 2007-03-19 15:31:42 -0400 | [diff] [blame] | 1174 | uhci_show_qh(uhci, urbp->qh, errbuf, |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1175 | ERRBUF_LEN, 0); |
| 1176 | lprintk(errbuf); |
| 1177 | } |
| 1178 | } |
| 1179 | |
| 1180 | } else if (len < uhci_expected_length(td_token(td))) { |
| 1181 | |
| 1182 | /* We received a short packet */ |
| 1183 | if (urb->transfer_flags & URB_SHORT_NOT_OK) |
| 1184 | ret = -EREMOTEIO; |
Alan Stern | f443ddf | 2006-07-31 10:16:24 -0400 | [diff] [blame] | 1185 | |
| 1186 | /* Fixup needed only if this isn't the URB's last TD */ |
| 1187 | else if (&td->list != urbp->td_list.prev) |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1188 | ret = 1; |
| 1189 | } |
| 1190 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 1191 | uhci_remove_td_from_urbp(td); |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1192 | if (qh->post_td) |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 1193 | uhci_free_td(uhci, qh->post_td); |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1194 | qh->post_td = td; |
| 1195 | |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1196 | if (ret != 0) |
| 1197 | goto err; |
| 1198 | } |
| 1199 | return ret; |
| 1200 | |
| 1201 | err: |
| 1202 | if (ret < 0) { |
| 1203 | /* In case a control transfer gets an error |
| 1204 | * during the setup stage */ |
| 1205 | urb->actual_length = max(urb->actual_length, 0); |
| 1206 | |
| 1207 | /* Note that the queue has stopped and save |
| 1208 | * the next toggle value */ |
| 1209 | qh->element = UHCI_PTR_TERM; |
| 1210 | qh->is_stopped = 1; |
| 1211 | qh->needs_fixup = (qh->type != USB_ENDPOINT_XFER_CONTROL); |
| 1212 | qh->initial_toggle = uhci_toggle(td_token(td)) ^ |
| 1213 | (ret == -EREMOTEIO); |
| 1214 | |
| 1215 | } else /* Short packet received */ |
Alan Stern | 59e29ed | 2006-05-12 11:19:19 -0400 | [diff] [blame] | 1216 | ret = uhci_fixup_short_transfer(uhci, qh, urbp); |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1217 | return ret; |
| 1218 | } |
| 1219 | |
| 1220 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | * Isochronous transfers |
| 1222 | */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1223 | static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb, |
| 1224 | struct uhci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1226 | struct uhci_td *td = NULL; /* Since urb->number_of_packets > 0 */ |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1227 | int i, frame; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1228 | unsigned long destination, status; |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 1229 | struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1231 | /* Values must not be too big (could overflow below) */ |
| 1232 | if (urb->interval >= UHCI_NUMFRAMES || |
| 1233 | urb->number_of_packets >= UHCI_NUMFRAMES) |
| 1234 | return -EFBIG; |
| 1235 | |
| 1236 | /* Check the period and figure out the starting frame number */ |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1237 | if (!qh->bandwidth_reserved) { |
| 1238 | qh->period = urb->interval; |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1239 | if (urb->transfer_flags & URB_ISO_ASAP) { |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1240 | qh->phase = -1; /* Find the best phase */ |
| 1241 | i = uhci_check_bandwidth(uhci, qh); |
| 1242 | if (i) |
| 1243 | return i; |
| 1244 | |
| 1245 | /* Allow a little time to allocate the TDs */ |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1246 | uhci_get_current_frame_number(uhci); |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1247 | frame = uhci->frame_number + 10; |
| 1248 | |
| 1249 | /* Move forward to the first frame having the |
| 1250 | * correct phase */ |
| 1251 | urb->start_frame = frame + ((qh->phase - frame) & |
| 1252 | (qh->period - 1)); |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1253 | } else { |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1254 | i = urb->start_frame - uhci->last_iso_frame; |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1255 | if (i <= 0 || i >= UHCI_NUMFRAMES) |
| 1256 | return -EINVAL; |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1257 | qh->phase = urb->start_frame & (qh->period - 1); |
| 1258 | i = uhci_check_bandwidth(uhci, qh); |
| 1259 | if (i) |
| 1260 | return i; |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1261 | } |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1262 | |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1263 | } else if (qh->period != urb->interval) { |
| 1264 | return -EINVAL; /* Can't change the period */ |
| 1265 | |
| 1266 | } else { /* Pick up where the last URB leaves off */ |
| 1267 | if (list_empty(&qh->queue)) { |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1268 | frame = qh->iso_frame; |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1269 | } else { |
| 1270 | struct urb *lurb; |
| 1271 | |
| 1272 | lurb = list_entry(qh->queue.prev, |
| 1273 | struct urb_priv, node)->urb; |
| 1274 | frame = lurb->start_frame + |
| 1275 | lurb->number_of_packets * |
| 1276 | lurb->interval; |
| 1277 | } |
| 1278 | if (urb->transfer_flags & URB_ISO_ASAP) |
| 1279 | urb->start_frame = frame; |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1280 | else if (urb->start_frame != frame) |
| 1281 | return -EINVAL; |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1282 | } |
| 1283 | |
| 1284 | /* 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] | 1285 | if (uhci_frame_before_eq(uhci->last_iso_frame + UHCI_NUMFRAMES, |
Alan Stern | caf3827 | 2006-05-19 16:44:55 -0400 | [diff] [blame] | 1286 | urb->start_frame + urb->number_of_packets * |
| 1287 | urb->interval)) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1288 | return -EFBIG; |
| 1289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | status = TD_CTRL_ACTIVE | TD_CTRL_IOS; |
| 1291 | destination = (urb->pipe & PIPE_DEVEP_MASK) | usb_packetid(urb->pipe); |
| 1292 | |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 1293 | for (i = 0; i < urb->number_of_packets; i++) { |
Alan Stern | 2532178 | 2005-04-25 11:14:31 -0400 | [diff] [blame] | 1294 | td = uhci_alloc_td(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | if (!td) |
| 1296 | return -ENOMEM; |
| 1297 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 1298 | uhci_add_td_to_urbp(td, urbp); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1299 | uhci_fill_td(td, status, destination | |
| 1300 | uhci_explen(urb->iso_frame_desc[i].length), |
| 1301 | urb->transfer_dma + |
| 1302 | urb->iso_frame_desc[i].offset); |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 1303 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1305 | /* Set the interrupt-on-completion flag on the last packet. */ |
| 1306 | td->status |= __constant_cpu_to_le32(TD_CTRL_IOC); |
| 1307 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1308 | /* Add the TDs to the frame list */ |
Alan Stern | b81d343 | 2005-10-13 17:00:24 -0400 | [diff] [blame] | 1309 | frame = urb->start_frame; |
| 1310 | list_for_each_entry(td, &urbp->td_list, list) { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1311 | uhci_insert_td_in_frame_list(uhci, td, frame); |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1312 | frame += qh->period; |
| 1313 | } |
| 1314 | |
| 1315 | if (list_empty(&qh->queue)) { |
| 1316 | qh->iso_packet_desc = &urb->iso_frame_desc[0]; |
| 1317 | qh->iso_frame = urb->start_frame; |
| 1318 | qh->iso_status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | } |
| 1320 | |
Alan Stern | 17230ac | 2007-02-19 15:52:45 -0500 | [diff] [blame] | 1321 | qh->skel = SKEL_ISO; |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1322 | if (!qh->bandwidth_reserved) |
| 1323 | uhci_reserve_bandwidth(uhci, qh); |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1324 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | } |
| 1326 | |
| 1327 | static int uhci_result_isochronous(struct uhci_hcd *uhci, struct urb *urb) |
| 1328 | { |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1329 | struct uhci_td *td, *tmp; |
| 1330 | struct urb_priv *urbp = urb->hcpriv; |
| 1331 | struct uhci_qh *qh = urbp->qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1333 | list_for_each_entry_safe(td, tmp, &urbp->td_list, list) { |
| 1334 | unsigned int ctrlstat; |
| 1335 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | int actlength; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1338 | if (uhci_frame_before_eq(uhci->cur_iso_frame, qh->iso_frame)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | return -EINPROGRESS; |
| 1340 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1341 | uhci_remove_tds_from_frame(uhci, qh->iso_frame); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1343 | ctrlstat = td_status(td); |
| 1344 | if (ctrlstat & TD_CTRL_ACTIVE) { |
| 1345 | status = -EXDEV; /* TD was added too late? */ |
| 1346 | } else { |
| 1347 | status = uhci_map_status(uhci_status_bits(ctrlstat), |
| 1348 | usb_pipeout(urb->pipe)); |
| 1349 | actlength = uhci_actual_length(ctrlstat); |
| 1350 | |
| 1351 | urb->actual_length += actlength; |
| 1352 | qh->iso_packet_desc->actual_length = actlength; |
| 1353 | qh->iso_packet_desc->status = status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | } |
| 1355 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1356 | if (status) { |
| 1357 | urb->error_count++; |
| 1358 | qh->iso_status = status; |
| 1359 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1361 | uhci_remove_td_from_urbp(td); |
| 1362 | uhci_free_td(uhci, td); |
| 1363 | qh->iso_frame += qh->period; |
| 1364 | ++qh->iso_packet_desc; |
| 1365 | } |
| 1366 | return qh->iso_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | } |
| 1368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | static int uhci_urb_enqueue(struct usb_hcd *hcd, |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1370 | struct usb_host_endpoint *hep, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1371 | struct urb *urb, gfp_t mem_flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | { |
| 1373 | int ret; |
| 1374 | struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| 1375 | unsigned long flags; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1376 | struct urb_priv *urbp; |
| 1377 | struct uhci_qh *qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | |
| 1379 | spin_lock_irqsave(&uhci->lock, flags); |
| 1380 | |
| 1381 | ret = urb->status; |
| 1382 | if (ret != -EINPROGRESS) /* URB already unlinked! */ |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1383 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1385 | ret = -ENOMEM; |
| 1386 | urbp = uhci_alloc_urb_priv(uhci, urb); |
| 1387 | if (!urbp) |
| 1388 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1390 | if (hep->hcpriv) |
| 1391 | qh = (struct uhci_qh *) hep->hcpriv; |
| 1392 | else { |
| 1393 | qh = uhci_alloc_qh(uhci, urb->dev, hep); |
| 1394 | if (!qh) |
| 1395 | goto err_no_qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | } |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1397 | urbp->qh = qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | |
Alan Stern | 4de7d2c | 2006-05-05 16:26:58 -0400 | [diff] [blame] | 1399 | switch (qh->type) { |
| 1400 | case USB_ENDPOINT_XFER_CONTROL: |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1401 | ret = uhci_submit_control(uhci, urb, qh); |
| 1402 | break; |
Alan Stern | 4de7d2c | 2006-05-05 16:26:58 -0400 | [diff] [blame] | 1403 | case USB_ENDPOINT_XFER_BULK: |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1404 | ret = uhci_submit_bulk(uhci, urb, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | break; |
Alan Stern | 4de7d2c | 2006-05-05 16:26:58 -0400 | [diff] [blame] | 1406 | case USB_ENDPOINT_XFER_INT: |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1407 | ret = uhci_submit_interrupt(uhci, urb, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | break; |
Alan Stern | 4de7d2c | 2006-05-05 16:26:58 -0400 | [diff] [blame] | 1409 | case USB_ENDPOINT_XFER_ISOC: |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1410 | urb->error_count = 0; |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1411 | ret = uhci_submit_isochronous(uhci, urb, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1412 | break; |
| 1413 | } |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1414 | if (ret != 0) |
| 1415 | goto err_submit_failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1417 | /* Add this URB to the QH */ |
| 1418 | urbp->qh = qh; |
| 1419 | list_add_tail(&urbp->node, &qh->queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1421 | /* If the new URB is the first and only one on this QH then either |
| 1422 | * 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] | 1423 | * become idle, so we can activate it right away. But only if the |
| 1424 | * queue isn't stopped. */ |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1425 | if (qh->queue.next == &urbp->node && !qh->is_stopped) { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1426 | uhci_activate_qh(uhci, qh); |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1427 | uhci_urbp_wants_fsbr(uhci, urbp); |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1428 | } |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1429 | goto done; |
| 1430 | |
| 1431 | err_submit_failed: |
| 1432 | if (qh->state == QH_STATE_IDLE) |
| 1433 | uhci_make_qh_idle(uhci, qh); /* Reclaim unused QH */ |
| 1434 | |
| 1435 | err_no_qh: |
| 1436 | uhci_free_urb_priv(uhci, urbp); |
| 1437 | |
| 1438 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | spin_unlock_irqrestore(&uhci->lock, flags); |
| 1440 | return ret; |
| 1441 | } |
| 1442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | static int uhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb) |
| 1444 | { |
| 1445 | struct uhci_hcd *uhci = hcd_to_uhci(hcd); |
| 1446 | unsigned long flags; |
| 1447 | struct urb_priv *urbp; |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 1448 | struct uhci_qh *qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | |
| 1450 | spin_lock_irqsave(&uhci->lock, flags); |
| 1451 | urbp = urb->hcpriv; |
| 1452 | if (!urbp) /* URB was never linked! */ |
| 1453 | goto done; |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 1454 | qh = urbp->qh; |
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 | /* Remove Isochronous TDs from the frame list ASAP */ |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 1457 | if (qh->type == USB_ENDPOINT_XFER_ISOC) { |
Alan Stern | dccf4a4 | 2005-12-17 17:58:46 -0500 | [diff] [blame] | 1458 | uhci_unlink_isochronous_tds(uhci, urb); |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 1459 | mb(); |
| 1460 | |
| 1461 | /* If the URB has already started, update the QH unlink time */ |
| 1462 | uhci_get_current_frame_number(uhci); |
| 1463 | if (uhci_frame_before_eq(urb->start_frame, uhci->frame_number)) |
| 1464 | qh->unlink_frame = uhci->frame_number; |
| 1465 | } |
| 1466 | |
| 1467 | uhci_unlink_qh(uhci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | |
| 1469 | done: |
| 1470 | spin_unlock_irqrestore(&uhci->lock, flags); |
| 1471 | return 0; |
| 1472 | } |
| 1473 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1474 | /* |
| 1475 | * Finish unlinking an URB and give it back |
| 1476 | */ |
| 1477 | static void uhci_giveback_urb(struct uhci_hcd *uhci, struct uhci_qh *qh, |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1478 | struct urb *urb) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1479 | __releases(uhci->lock) |
| 1480 | __acquires(uhci->lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | { |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1482 | struct urb_priv *urbp = (struct urb_priv *) urb->hcpriv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1484 | /* When giving back the first URB in an Isochronous queue, |
| 1485 | * reinitialize the QH's iso-related members for the next URB. */ |
| 1486 | if (qh->type == USB_ENDPOINT_XFER_ISOC && |
| 1487 | urbp->node.prev == &qh->queue && |
| 1488 | urbp->node.next != &qh->queue) { |
| 1489 | struct urb *nurb = list_entry(urbp->node.next, |
| 1490 | struct urb_priv, node)->urb; |
| 1491 | |
| 1492 | qh->iso_packet_desc = &nurb->iso_frame_desc[0]; |
| 1493 | qh->iso_frame = nurb->start_frame; |
| 1494 | qh->iso_status = 0; |
| 1495 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1497 | /* Take the URB off the QH's queue. If the queue is now empty, |
| 1498 | * this is a perfect time for a toggle fixup. */ |
| 1499 | list_del_init(&urbp->node); |
| 1500 | if (list_empty(&qh->queue) && qh->needs_fixup) { |
| 1501 | usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), |
| 1502 | usb_pipeout(urb->pipe), qh->initial_toggle); |
| 1503 | qh->needs_fixup = 0; |
| 1504 | } |
| 1505 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1506 | uhci_free_urb_priv(uhci, urbp); |
| 1507 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1508 | spin_unlock(&uhci->lock); |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1509 | usb_hcd_giveback_urb(uhci_to_hcd(uhci), urb); |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1510 | spin_lock(&uhci->lock); |
| 1511 | |
| 1512 | /* If the queue is now empty, we can unlink the QH and give up its |
| 1513 | * reserved bandwidth. */ |
| 1514 | if (list_empty(&qh->queue)) { |
| 1515 | uhci_unlink_qh(uhci, qh); |
Alan Stern | 3ca2a32 | 2007-01-16 11:56:32 -0500 | [diff] [blame] | 1516 | if (qh->bandwidth_reserved) |
| 1517 | uhci_release_bandwidth(uhci, qh); |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1518 | } |
| 1519 | } |
| 1520 | |
| 1521 | /* |
| 1522 | * Scan the URBs in a QH's queue |
| 1523 | */ |
| 1524 | #define QH_FINISHED_UNLINKING(qh) \ |
| 1525 | (qh->state == QH_STATE_UNLINKING && \ |
| 1526 | uhci->frame_number + uhci->is_stopped != qh->unlink_frame) |
| 1527 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1528 | 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] | 1529 | { |
| 1530 | struct urb_priv *urbp; |
| 1531 | struct urb *urb; |
| 1532 | int status; |
| 1533 | |
| 1534 | while (!list_empty(&qh->queue)) { |
| 1535 | urbp = list_entry(qh->queue.next, struct urb_priv, node); |
| 1536 | urb = urbp->urb; |
| 1537 | |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1538 | if (qh->type == USB_ENDPOINT_XFER_ISOC) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1539 | status = uhci_result_isochronous(uhci, urb); |
Alan Stern | b186900 | 2006-05-12 11:14:25 -0400 | [diff] [blame] | 1540 | else |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1541 | status = uhci_result_common(uhci, urb); |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1542 | if (status == -EINPROGRESS) |
| 1543 | break; |
| 1544 | |
| 1545 | spin_lock(&urb->lock); |
| 1546 | if (urb->status == -EINPROGRESS) /* Not dequeued */ |
| 1547 | urb->status = status; |
| 1548 | else |
Alan Stern | 2775562 | 2006-05-05 16:32:02 -0400 | [diff] [blame] | 1549 | status = ECONNRESET; /* Not -ECONNRESET */ |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1550 | spin_unlock(&urb->lock); |
| 1551 | |
| 1552 | /* Dequeued but completed URBs can't be given back unless |
| 1553 | * the QH is stopped or has finished unlinking. */ |
Alan Stern | 2775562 | 2006-05-05 16:32:02 -0400 | [diff] [blame] | 1554 | if (status == ECONNRESET) { |
| 1555 | if (QH_FINISHED_UNLINKING(qh)) |
| 1556 | qh->is_stopped = 1; |
| 1557 | else if (!qh->is_stopped) |
| 1558 | return; |
| 1559 | } |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1560 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1561 | uhci_giveback_urb(uhci, qh, urb); |
Alan Stern | 7ceb932 | 2006-08-21 11:58:50 -0400 | [diff] [blame] | 1562 | if (status < 0 && qh->type != USB_ENDPOINT_XFER_ISOC) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1563 | break; |
| 1564 | } |
| 1565 | |
| 1566 | /* If the QH is neither stopped nor finished unlinking (normal case), |
| 1567 | * our work here is done. */ |
Alan Stern | 2775562 | 2006-05-05 16:32:02 -0400 | [diff] [blame] | 1568 | if (QH_FINISHED_UNLINKING(qh)) |
| 1569 | qh->is_stopped = 1; |
| 1570 | else if (!qh->is_stopped) |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1571 | return; |
| 1572 | |
| 1573 | /* Otherwise give back each of the dequeued URBs */ |
Alan Stern | 2775562 | 2006-05-05 16:32:02 -0400 | [diff] [blame] | 1574 | restart: |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1575 | list_for_each_entry(urbp, &qh->queue, node) { |
| 1576 | urb = urbp->urb; |
| 1577 | if (urb->status != -EINPROGRESS) { |
Alan Stern | 10b8e47 | 2006-05-19 16:39:52 -0400 | [diff] [blame] | 1578 | |
| 1579 | /* Fix up the TD links and save the toggles for |
| 1580 | * non-Isochronous queues. For Isochronous queues, |
| 1581 | * test for too-recent dequeues. */ |
| 1582 | if (!uhci_cleanup_queue(uhci, qh, urb)) { |
| 1583 | qh->is_stopped = 0; |
| 1584 | return; |
| 1585 | } |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1586 | uhci_giveback_urb(uhci, qh, urb); |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1587 | goto restart; |
| 1588 | } |
| 1589 | } |
| 1590 | qh->is_stopped = 0; |
| 1591 | |
| 1592 | /* There are no more dequeued URBs. If there are still URBs on the |
| 1593 | * queue, the QH can now be re-activated. */ |
| 1594 | if (!list_empty(&qh->queue)) { |
| 1595 | if (qh->needs_fixup) |
| 1596 | uhci_fixup_toggles(qh, 0); |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1597 | |
| 1598 | /* If the first URB on the queue wants FSBR but its time |
| 1599 | * limit has expired, set the next TD to interrupt on |
| 1600 | * completion before reactivating the QH. */ |
| 1601 | urbp = list_entry(qh->queue.next, struct urb_priv, node); |
| 1602 | if (urbp->fsbr && qh->wait_expired) { |
| 1603 | struct uhci_td *td = list_entry(urbp->td_list.next, |
| 1604 | struct uhci_td, list); |
| 1605 | |
| 1606 | td->status |= __cpu_to_le32(TD_CTRL_IOC); |
| 1607 | } |
| 1608 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1609 | uhci_activate_qh(uhci, qh); |
| 1610 | } |
| 1611 | |
| 1612 | /* The queue is empty. The QH can become idle if it is fully |
| 1613 | * unlinked. */ |
| 1614 | else if (QH_FINISHED_UNLINKING(qh)) |
| 1615 | uhci_make_qh_idle(uhci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | } |
| 1617 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1618 | /* |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1619 | * Check for queues that have made some forward progress. |
| 1620 | * Returns 0 if the queue is not Isochronous, is ACTIVE, and |
| 1621 | * has not advanced since last examined; 1 otherwise. |
Alan Stern | b761d9d | 2006-05-12 11:41:59 -0400 | [diff] [blame] | 1622 | * |
| 1623 | * Early Intel controllers have a bug which causes qh->element sometimes |
| 1624 | * not to advance when a TD completes successfully. The queue remains |
| 1625 | * stuck on the inactive completed TD. We detect such cases and advance |
| 1626 | * the element pointer by hand. |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1627 | */ |
| 1628 | static int uhci_advance_check(struct uhci_hcd *uhci, struct uhci_qh *qh) |
| 1629 | { |
| 1630 | struct urb_priv *urbp = NULL; |
| 1631 | struct uhci_td *td; |
| 1632 | int ret = 1; |
| 1633 | unsigned status; |
| 1634 | |
| 1635 | if (qh->type == USB_ENDPOINT_XFER_ISOC) |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1636 | goto done; |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1637 | |
| 1638 | /* Treat an UNLINKING queue as though it hasn't advanced. |
| 1639 | * This is okay because reactivation will treat it as though |
| 1640 | * it has advanced, and if it is going to become IDLE then |
| 1641 | * this doesn't matter anyway. Furthermore it's possible |
| 1642 | * for an UNLINKING queue not to have any URBs at all, or |
| 1643 | * for its first URB not to have any TDs (if it was dequeued |
| 1644 | * just as it completed). So it's not easy in any case to |
| 1645 | * test whether such queues have advanced. */ |
| 1646 | if (qh->state != QH_STATE_ACTIVE) { |
| 1647 | urbp = NULL; |
| 1648 | status = 0; |
| 1649 | |
| 1650 | } else { |
| 1651 | urbp = list_entry(qh->queue.next, struct urb_priv, node); |
| 1652 | td = list_entry(urbp->td_list.next, struct uhci_td, list); |
| 1653 | status = td_status(td); |
| 1654 | if (!(status & TD_CTRL_ACTIVE)) { |
| 1655 | |
| 1656 | /* We're okay, the queue has advanced */ |
| 1657 | qh->wait_expired = 0; |
| 1658 | qh->advance_jiffies = jiffies; |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1659 | goto done; |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1660 | } |
| 1661 | ret = 0; |
| 1662 | } |
| 1663 | |
| 1664 | /* The queue hasn't advanced; check for timeout */ |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1665 | if (qh->wait_expired) |
| 1666 | goto done; |
| 1667 | |
| 1668 | if (time_after(jiffies, qh->advance_jiffies + QH_WAIT_TIMEOUT)) { |
Alan Stern | b761d9d | 2006-05-12 11:41:59 -0400 | [diff] [blame] | 1669 | |
| 1670 | /* Detect the Intel bug and work around it */ |
Alan Stern | 28b9325 | 2007-02-19 15:51:51 -0500 | [diff] [blame] | 1671 | if (qh->post_td && qh_element(qh) == LINK_TO_TD(qh->post_td)) { |
Alan Stern | b761d9d | 2006-05-12 11:41:59 -0400 | [diff] [blame] | 1672 | qh->element = qh->post_td->link; |
| 1673 | qh->advance_jiffies = jiffies; |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1674 | ret = 1; |
| 1675 | goto done; |
Alan Stern | b761d9d | 2006-05-12 11:41:59 -0400 | [diff] [blame] | 1676 | } |
| 1677 | |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1678 | qh->wait_expired = 1; |
| 1679 | |
| 1680 | /* If the current URB wants FSBR, unlink it temporarily |
| 1681 | * so that we can safely set the next TD to interrupt on |
| 1682 | * completion. That way we'll know as soon as the queue |
| 1683 | * starts moving again. */ |
| 1684 | if (urbp && urbp->fsbr && !(status & TD_CTRL_IOC)) |
| 1685 | uhci_unlink_qh(uhci, qh); |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1686 | |
| 1687 | } else { |
| 1688 | /* Unmoving but not-yet-expired queues keep FSBR alive */ |
| 1689 | if (urbp) |
| 1690 | uhci_urbp_wants_fsbr(uhci, urbp); |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1691 | } |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1692 | |
| 1693 | done: |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1694 | return ret; |
| 1695 | } |
| 1696 | |
| 1697 | /* |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1698 | * Process events in the schedule, but only in one thread at a time |
| 1699 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1700 | static void uhci_scan_schedule(struct uhci_hcd *uhci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | { |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1702 | int i; |
| 1703 | struct uhci_qh *qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | |
| 1705 | /* Don't allow re-entrant calls */ |
| 1706 | if (uhci->scan_in_progress) { |
| 1707 | uhci->need_rescan = 1; |
| 1708 | return; |
| 1709 | } |
| 1710 | uhci->scan_in_progress = 1; |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1711 | rescan: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | uhci->need_rescan = 0; |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1713 | uhci->fsbr_is_wanted = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | |
Alan Stern | 6c1b445 | 2005-04-21 16:04:58 -0400 | [diff] [blame] | 1715 | uhci_clear_next_interrupt(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | uhci_get_current_frame_number(uhci); |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1717 | uhci->cur_iso_frame = uhci->frame_number; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1719 | /* Go through all the QH queues and process the URBs in each one */ |
| 1720 | for (i = 0; i < UHCI_NUM_SKELQH - 1; ++i) { |
| 1721 | uhci->next_qh = list_entry(uhci->skelqh[i]->node.next, |
| 1722 | struct uhci_qh, node); |
| 1723 | while ((qh = uhci->next_qh) != uhci->skelqh[i]) { |
| 1724 | uhci->next_qh = list_entry(qh->node.next, |
| 1725 | struct uhci_qh, node); |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1726 | |
| 1727 | if (uhci_advance_check(uhci, qh)) { |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1728 | uhci_scan_qh(uhci, qh); |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1729 | if (qh->state == QH_STATE_ACTIVE) { |
| 1730 | uhci_urbp_wants_fsbr(uhci, |
| 1731 | list_entry(qh->queue.next, struct urb_priv, node)); |
| 1732 | } |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1733 | } |
Alan Stern | 0ed8fee | 2005-12-17 18:02:38 -0500 | [diff] [blame] | 1734 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | |
Alan Stern | c8155cc | 2006-05-19 16:52:35 -0400 | [diff] [blame] | 1737 | uhci->last_iso_frame = uhci->cur_iso_frame; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | if (uhci->need_rescan) |
| 1739 | goto rescan; |
| 1740 | uhci->scan_in_progress = 0; |
| 1741 | |
Alan Stern | c5e3b74 | 2006-06-05 12:28:57 -0400 | [diff] [blame] | 1742 | if (uhci->fsbr_is_on && !uhci->fsbr_is_wanted && |
| 1743 | !uhci->fsbr_expiring) { |
| 1744 | uhci->fsbr_expiring = 1; |
| 1745 | mod_timer(&uhci->fsbr_timer, jiffies + FSBR_OFF_DELAY); |
| 1746 | } |
Alan Stern | 84afddd | 2006-05-12 11:35:45 -0400 | [diff] [blame] | 1747 | |
Alan Stern | 04538a2 | 2006-05-12 11:29:04 -0400 | [diff] [blame] | 1748 | if (list_empty(&uhci->skel_unlink_qh->node)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1749 | uhci_clear_next_interrupt(uhci); |
| 1750 | else |
| 1751 | uhci_set_next_interrupt(uhci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | } |