Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
David Brownell | d49d431 | 2005-05-07 13:21:50 -0700 | [diff] [blame] | 2 | * Copyright (C) 2001-2004 by David Brownell |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License as published by the |
| 6 | * Free Software Foundation; either version 2 of the License, or (at your |
| 7 | * option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 11 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software Foundation, |
| 16 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 17 | */ |
| 18 | |
| 19 | /* this file is part of ehci-hcd.c */ |
| 20 | |
| 21 | /*-------------------------------------------------------------------------*/ |
| 22 | |
| 23 | /* |
| 24 | * EHCI hardware queue manipulation ... the core. QH/QTD manipulation. |
| 25 | * |
| 26 | * Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd" |
| 27 | * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned |
| 28 | * buffers needed for the larger number). We use one QH per endpoint, queue |
| 29 | * multiple urbs (all three types) per endpoint. URBs may need several qtds. |
| 30 | * |
| 31 | * ISO traffic uses "ISO TD" (itd, and sitd) records, and (along with |
| 32 | * interrupts) needs careful scheduling. Performance improvements can be |
| 33 | * an ongoing challenge. That's in "ehci-sched.c". |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 34 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs, |
| 36 | * or otherwise through transaction translators (TTs) in USB 2.0 hubs using |
| 37 | * (b) special fields in qh entries or (c) split iso entries. TTs will |
| 38 | * buffer low/full speed data so the host collects it at high speed. |
| 39 | */ |
| 40 | |
| 41 | /*-------------------------------------------------------------------------*/ |
| 42 | |
| 43 | /* fill a qtd, returning how much of the buffer we were able to queue up */ |
| 44 | |
| 45 | static int |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 46 | qtd_fill(struct ehci_hcd *ehci, struct ehci_qtd *qtd, dma_addr_t buf, |
| 47 | size_t len, int token, int maxpacket) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | { |
| 49 | int i, count; |
| 50 | u64 addr = buf; |
| 51 | |
| 52 | /* one buffer entry per 4K ... first might be short or unaligned */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 53 | qtd->hw_buf[0] = cpu_to_hc32(ehci, (u32)addr); |
| 54 | qtd->hw_buf_hi[0] = cpu_to_hc32(ehci, (u32)(addr >> 32)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | count = 0x1000 - (buf & 0x0fff); /* rest of that page */ |
| 56 | if (likely (len < count)) /* ... iff needed */ |
| 57 | count = len; |
| 58 | else { |
| 59 | buf += 0x1000; |
| 60 | buf &= ~0x0fff; |
| 61 | |
| 62 | /* per-qtd limit: from 16K to 20K (best alignment) */ |
| 63 | for (i = 1; count < len && i < 5; i++) { |
| 64 | addr = buf; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 65 | qtd->hw_buf[i] = cpu_to_hc32(ehci, (u32)addr); |
| 66 | qtd->hw_buf_hi[i] = cpu_to_hc32(ehci, |
| 67 | (u32)(addr >> 32)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | buf += 0x1000; |
| 69 | if ((count + 0x1000) < len) |
| 70 | count += 0x1000; |
| 71 | else |
| 72 | count = len; |
| 73 | } |
| 74 | |
| 75 | /* short packets may only terminate transfers */ |
| 76 | if (count != len) |
| 77 | count -= (count % maxpacket); |
| 78 | } |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 79 | qtd->hw_token = cpu_to_hc32(ehci, (count << 16) | token); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | qtd->length = count; |
| 81 | |
| 82 | return count; |
| 83 | } |
| 84 | |
| 85 | /*-------------------------------------------------------------------------*/ |
| 86 | |
| 87 | static inline void |
| 88 | qh_update (struct ehci_hcd *ehci, struct ehci_qh *qh, struct ehci_qtd *qtd) |
| 89 | { |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 90 | struct ehci_qh_hw *hw = qh->hw; |
| 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | /* writes to an active overlay are unsafe */ |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 93 | WARN_ON(qh->qh_state != QH_STATE_IDLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 95 | hw->hw_qtd_next = QTD_NEXT(ehci, qtd->qtd_dma); |
| 96 | hw->hw_alt_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 98 | /* Except for control endpoints, we make hardware maintain data |
| 99 | * toggle (like OHCI) ... here (re)initialize the toggle in the QH, |
| 100 | * and set the pseudo-toggle in udev. Only usb_clear_halt() will |
| 101 | * ever clear it. |
| 102 | */ |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 103 | if (!(hw->hw_info1 & cpu_to_hc32(ehci, QH_TOGGLE_CTL))) { |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 104 | unsigned is_out, epnum; |
| 105 | |
Alan Stern | e04f5f7 | 2011-07-19 14:01:23 -0400 | [diff] [blame] | 106 | is_out = qh->is_out; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 107 | epnum = (hc32_to_cpup(ehci, &hw->hw_info1) >> 8) & 0x0f; |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 108 | if (unlikely(!usb_gettoggle(qh->ps.udev, epnum, is_out))) { |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 109 | hw->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE); |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 110 | usb_settoggle(qh->ps.udev, epnum, is_out, 1); |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 111 | } |
| 112 | } |
| 113 | |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 114 | hw->hw_token &= cpu_to_hc32(ehci, QTD_TOGGLE | QTD_STS_PING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | /* if it weren't for a common silicon quirk (writing the dummy into the qh |
| 118 | * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault |
| 119 | * recovery (including urb dequeue) would need software changes to a QH... |
| 120 | */ |
| 121 | static void |
| 122 | qh_refresh (struct ehci_hcd *ehci, struct ehci_qh *qh) |
| 123 | { |
| 124 | struct ehci_qtd *qtd; |
| 125 | |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 126 | qtd = list_entry(qh->qtd_list.next, struct ehci_qtd, qtd_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 128 | /* |
| 129 | * first qtd may already be partially processed. |
| 130 | * If we come here during unlink, the QH overlay region |
| 131 | * might have reference to the just unlinked qtd. The |
| 132 | * qtd is updated in qh_completions(). Update the QH |
| 133 | * overlay here. |
| 134 | */ |
| 135 | if (qh->hw->hw_token & ACTIVE_BIT(ehci)) |
| 136 | qh->hw->hw_qtd_next = qtd->hw_next; |
| 137 | else |
| 138 | qh_update(ehci, qh, qtd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | } |
| 140 | |
| 141 | /*-------------------------------------------------------------------------*/ |
| 142 | |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 143 | static void qh_link_async(struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 144 | |
| 145 | static void ehci_clear_tt_buffer_complete(struct usb_hcd *hcd, |
| 146 | struct usb_host_endpoint *ep) |
| 147 | { |
| 148 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| 149 | struct ehci_qh *qh = ep->hcpriv; |
| 150 | unsigned long flags; |
| 151 | |
| 152 | spin_lock_irqsave(&ehci->lock, flags); |
| 153 | qh->clearing_tt = 0; |
| 154 | if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list) |
Alan Stern | e879990 | 2011-08-18 16:31:30 -0400 | [diff] [blame] | 155 | && ehci->rh_state == EHCI_RH_RUNNING) |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 156 | qh_link_async(ehci, qh); |
| 157 | spin_unlock_irqrestore(&ehci->lock, flags); |
| 158 | } |
| 159 | |
| 160 | static void ehci_clear_tt_buffer(struct ehci_hcd *ehci, struct ehci_qh *qh, |
| 161 | struct urb *urb, u32 token) |
| 162 | { |
| 163 | |
| 164 | /* If an async split transaction gets an error or is unlinked, |
| 165 | * the TT buffer may be left in an indeterminate state. We |
| 166 | * have to clear the TT buffer. |
| 167 | * |
| 168 | * Note: this routine is never called for Isochronous transfers. |
| 169 | */ |
| 170 | if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) { |
Xenia Ragiadakou | 1512c91 | 2013-08-29 11:45:13 +0300 | [diff] [blame] | 171 | #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 172 | struct usb_device *tt = urb->dev->tt->hub; |
| 173 | dev_dbg(&tt->dev, |
| 174 | "clear tt buffer port %d, a%d ep%d t%08x\n", |
| 175 | urb->dev->ttport, urb->dev->devnum, |
| 176 | usb_pipeendpoint(urb->pipe), token); |
Xenia Ragiadakou | 1512c91 | 2013-08-29 11:45:13 +0300 | [diff] [blame] | 177 | #endif /* DEBUG || CONFIG_DYNAMIC_DEBUG */ |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 178 | if (!ehci_is_TDI(ehci) |
| 179 | || urb->dev->tt->hub != |
| 180 | ehci_to_hcd(ehci)->self.root_hub) { |
| 181 | if (usb_hub_clear_tt_buffer(urb) == 0) |
| 182 | qh->clearing_tt = 1; |
| 183 | } else { |
| 184 | |
| 185 | /* REVISIT ARC-derived cores don't clear the root |
| 186 | * hub TT buffer in this way... |
| 187 | */ |
| 188 | } |
| 189 | } |
| 190 | } |
| 191 | |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 192 | static int qtd_copy_status ( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | struct ehci_hcd *ehci, |
| 194 | struct urb *urb, |
| 195 | size_t length, |
| 196 | u32 token |
| 197 | ) |
| 198 | { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 199 | int status = -EINPROGRESS; |
| 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | /* count IN/OUT bytes, not SETUP (even short packets) */ |
| 202 | if (likely (QTD_PID (token) != 2)) |
| 203 | urb->actual_length += length - QTD_LENGTH (token); |
| 204 | |
| 205 | /* don't modify error codes */ |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 206 | if (unlikely(urb->unlinked)) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 207 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
| 209 | /* force cleanup after short read; not always an error */ |
| 210 | if (unlikely (IS_SHORT_READ (token))) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 211 | status = -EREMOTEIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | /* serious "can't proceed" faults reported by the hardware */ |
| 214 | if (token & QTD_STS_HALT) { |
| 215 | if (token & QTD_STS_BABBLE) { |
| 216 | /* FIXME "must" disable babbling device's port too */ |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 217 | status = -EOVERFLOW; |
Alan Stern | ba516de | 2009-06-29 17:36:14 -0400 | [diff] [blame] | 218 | /* CERR nonzero + halt --> stall */ |
| 219 | } else if (QTD_CERR(token)) { |
| 220 | status = -EPIPE; |
| 221 | |
| 222 | /* In theory, more than one of the following bits can be set |
| 223 | * since they are sticky and the transaction is retried. |
| 224 | * Which to test first is rather arbitrary. |
| 225 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | } else if (token & QTD_STS_MMF) { |
| 227 | /* fs/ls interrupt xfer missed the complete-split */ |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 228 | status = -EPROTO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } else if (token & QTD_STS_DBE) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 230 | status = (QTD_PID (token) == 1) /* IN ? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | ? -ENOSR /* hc couldn't read data */ |
| 232 | : -ECOMM; /* hc couldn't write data */ |
| 233 | } else if (token & QTD_STS_XACT) { |
Alan Stern | ba516de | 2009-06-29 17:36:14 -0400 | [diff] [blame] | 234 | /* timeout, bad CRC, wrong PID, etc */ |
| 235 | ehci_dbg(ehci, "devpath %s ep%d%s 3strikes\n", |
| 236 | urb->dev->devpath, |
| 237 | usb_pipeendpoint(urb->pipe), |
| 238 | usb_pipein(urb->pipe) ? "in" : "out"); |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 239 | status = -EPROTO; |
Alan Stern | ba516de | 2009-06-29 17:36:14 -0400 | [diff] [blame] | 240 | } else { /* unknown */ |
| 241 | status = -EPROTO; |
| 242 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 244 | |
| 245 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | } |
| 247 | |
| 248 | static void |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 249 | ehci_urb_done(struct ehci_hcd *ehci, struct urb *urb, int status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | { |
Alan Stern | 2656a9a | 2012-11-08 10:17:01 -0500 | [diff] [blame] | 251 | if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) { |
| 252 | /* ... update hc-wide periodic stats */ |
| 253 | ehci_to_hcd(ehci)->self.bandwidth_int_reqs--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | } |
| 255 | |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 256 | if (unlikely(urb->unlinked)) { |
| 257 | COUNT(ehci->stats.unlink); |
| 258 | } else { |
David Brownell | 4f66762 | 2008-04-12 08:32:05 -0700 | [diff] [blame] | 259 | /* report non-error and short read status as zero */ |
| 260 | if (status == -EINPROGRESS || status == -EREMOTEIO) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 261 | status = 0; |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 262 | COUNT(ehci->stats.complete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
| 265 | #ifdef EHCI_URB_TRACE |
| 266 | ehci_dbg (ehci, |
| 267 | "%s %s urb %p ep%d%s status %d len %d/%d\n", |
Harvey Harrison | 441b62c | 2008-03-03 16:08:34 -0800 | [diff] [blame] | 268 | __func__, urb->dev->devpath, urb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | usb_pipeendpoint (urb->pipe), |
| 270 | usb_pipein (urb->pipe) ? "in" : "out", |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 271 | status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | urb->actual_length, urb->transfer_buffer_length); |
| 273 | #endif |
| 274 | |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 275 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
Alan Stern | 4a00027 | 2007-08-24 15:42:24 -0400 | [diff] [blame] | 276 | usb_hcd_giveback_urb(ehci_to_hcd(ehci), urb, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | } |
| 278 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | static int qh_schedule (struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 280 | |
| 281 | /* |
| 282 | * Process and free completed qtds for a qh, returning URBs to drivers. |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame] | 283 | * Chases up to qh->hw_current. Returns nonzero if the caller should |
| 284 | * unlink qh. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | static unsigned |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 287 | qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | { |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 289 | struct ehci_qtd *last, *end = qh->dummy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | struct list_head *entry, *tmp; |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 291 | int last_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | int stopped; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | u8 state; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 294 | struct ehci_qh_hw *hw = qh->hw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | /* completions (or tasks on other cpus) must never clobber HALT |
| 297 | * till we've gone through and cleaned everything up, even when |
| 298 | * they add urbs to this qh's queue or mark them for unlinking. |
| 299 | * |
| 300 | * NOTE: unlinking expects to be done in queue order. |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 301 | * |
| 302 | * It's a bug for qh->qh_state to be anything other than |
| 303 | * QH_STATE_IDLE, unless our caller is scan_async() or |
Alan Stern | 569b394 | 2012-07-11 11:23:00 -0400 | [diff] [blame] | 304 | * scan_intr(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | */ |
| 306 | state = qh->qh_state; |
| 307 | qh->qh_state = QH_STATE_COMPLETING; |
| 308 | stopped = (state == QH_STATE_IDLE); |
| 309 | |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 310 | rescan: |
| 311 | last = NULL; |
| 312 | last_status = -EINPROGRESS; |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 313 | qh->dequeue_during_giveback = 0; |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 314 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | /* remove de-activated QTDs from front of queue. |
| 316 | * after faults (including short reads), cleanup this urb |
| 317 | * then let the queue advance. |
| 318 | * if queue is stopped, handles unlinks. |
| 319 | */ |
| 320 | list_for_each_safe (entry, tmp, &qh->qtd_list) { |
| 321 | struct ehci_qtd *qtd; |
| 322 | struct urb *urb; |
| 323 | u32 token = 0; |
| 324 | |
| 325 | qtd = list_entry (entry, struct ehci_qtd, qtd_list); |
| 326 | urb = qtd->urb; |
| 327 | |
| 328 | /* clean up any state from previous QTD ...*/ |
| 329 | if (last) { |
| 330 | if (likely (last->urb != urb)) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 331 | ehci_urb_done(ehci, last->urb, last_status); |
Misha Zhilin | b5f7a0e | 2008-02-27 18:05:24 -0800 | [diff] [blame] | 332 | last_status = -EINPROGRESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } |
| 334 | ehci_qtd_free (ehci, last); |
| 335 | last = NULL; |
| 336 | } |
| 337 | |
| 338 | /* ignore urbs submitted during completions we reported */ |
| 339 | if (qtd == end) |
| 340 | break; |
| 341 | |
| 342 | /* hardware copies qtd out of qh overlay */ |
| 343 | rmb (); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 344 | token = hc32_to_cpu(ehci, qtd->hw_token); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
| 346 | /* always clean up qtds the hc de-activated */ |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 347 | retry_xacterr: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | if ((token & QTD_STS_ACTIVE) == 0) { |
| 349 | |
Vikram Pandita | 332960b | 2011-10-30 12:55:09 -0700 | [diff] [blame] | 350 | /* Report Data Buffer Error: non-fatal but useful */ |
| 351 | if (token & QTD_STS_DBE) |
| 352 | ehci_dbg(ehci, |
| 353 | "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n", |
| 354 | urb, |
| 355 | usb_endpoint_num(&urb->ep->desc), |
| 356 | usb_endpoint_dir_in(&urb->ep->desc) ? "in" : "out", |
| 357 | urb->transfer_buffer_length, |
| 358 | qtd, |
| 359 | qh); |
| 360 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 361 | /* on STALL, error, and short reads this urb must |
| 362 | * complete and all its qtds must be recycled. |
| 363 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | if ((token & QTD_STS_HALT) != 0) { |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 365 | |
| 366 | /* retry transaction errors until we |
| 367 | * reach the software xacterr limit |
| 368 | */ |
| 369 | if ((token & QTD_STS_XACT) && |
| 370 | QTD_CERR(token) == 0 && |
Alan Stern | ef4638f | 2009-07-31 10:41:40 -0400 | [diff] [blame] | 371 | ++qh->xacterrs < QH_XACTERR_MAX && |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 372 | !urb->unlinked) { |
| 373 | ehci_dbg(ehci, |
Randy Dunlap | d062680 | 2009-02-13 11:22:06 -0800 | [diff] [blame] | 374 | "detected XactErr len %zu/%zu retry %d\n", |
Alan Stern | ef4638f | 2009-07-31 10:41:40 -0400 | [diff] [blame] | 375 | qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs); |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 376 | |
| 377 | /* reset the token in the qtd and the |
| 378 | * qh overlay (which still contains |
| 379 | * the qtd) so that we pick up from |
| 380 | * where we left off |
| 381 | */ |
| 382 | token &= ~QTD_STS_HALT; |
| 383 | token |= QTD_STS_ACTIVE | |
| 384 | (EHCI_TUNE_CERR << 10); |
| 385 | qtd->hw_token = cpu_to_hc32(ehci, |
| 386 | token); |
| 387 | wmb(); |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 388 | hw->hw_token = cpu_to_hc32(ehci, |
| 389 | token); |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 390 | goto retry_xacterr; |
| 391 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | stopped = 1; |
| 393 | |
| 394 | /* magic dummy for some short reads; qh won't advance. |
| 395 | * that silicon quirk can kick in with this dummy too. |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 396 | * |
| 397 | * other short reads won't stop the queue, including |
| 398 | * control transfers (status stage handles that) or |
| 399 | * most other single-qtd reads ... the queue stops if |
| 400 | * URB_SHORT_NOT_OK was set so the driver submitting |
| 401 | * the urbs could clean it up. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | */ |
| 403 | } else if (IS_SHORT_READ (token) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 404 | && !(qtd->hw_alt_next |
| 405 | & EHCI_LIST_END(ehci))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | stopped = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | } |
| 408 | |
| 409 | /* stop scanning when we reach qtds the hc is using */ |
| 410 | } else if (likely (!stopped |
Alan Stern | c0c53db | 2012-07-11 11:21:48 -0400 | [diff] [blame] | 411 | && ehci->rh_state >= EHCI_RH_RUNNING)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | break; |
| 413 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 414 | /* scan the whole queue for unlinks whenever it stops */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | } else { |
| 416 | stopped = 1; |
| 417 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 418 | /* cancel everything if we halt, suspend, etc */ |
Alan Stern | c0c53db | 2012-07-11 11:21:48 -0400 | [diff] [blame] | 419 | if (ehci->rh_state < EHCI_RH_RUNNING) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 420 | last_status = -ESHUTDOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 422 | /* this qtd is active; skip it unless a previous qtd |
| 423 | * for its urb faulted, or its urb was canceled. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | */ |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 425 | else if (last_status == -EINPROGRESS && !urb->unlinked) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | continue; |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 427 | |
Alan Stern | feca774 | 2013-03-01 10:51:15 -0500 | [diff] [blame] | 428 | /* |
| 429 | * If this was the active qtd when the qh was unlinked |
| 430 | * and the overlay's token is active, then the overlay |
| 431 | * hasn't been written back to the qtd yet so use its |
| 432 | * token instead of the qtd's. After the qtd is |
| 433 | * processed and removed, the overlay won't be valid |
| 434 | * any more. |
| 435 | */ |
| 436 | if (state == QH_STATE_IDLE && |
| 437 | qh->qtd_list.next == &qtd->qtd_list && |
| 438 | (hw->hw_token & ACTIVE_BIT(ehci))) { |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 439 | token = hc32_to_cpu(ehci, hw->hw_token); |
Alan Stern | feca774 | 2013-03-01 10:51:15 -0500 | [diff] [blame] | 440 | hw->hw_token &= ~ACTIVE_BIT(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 442 | /* An unlink may leave an incomplete |
| 443 | * async transaction in the TT buffer. |
| 444 | * We have to clear it. |
| 445 | */ |
| 446 | ehci_clear_tt_buffer(ehci, qh, urb, token); |
| 447 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 449 | |
David Brownell | 4f66762 | 2008-04-12 08:32:05 -0700 | [diff] [blame] | 450 | /* unless we already know the urb's status, collect qtd status |
| 451 | * and update count of bytes transferred. in common short read |
| 452 | * cases with only one data qtd (including control transfers), |
| 453 | * queue processing won't halt. but with two or more qtds (for |
| 454 | * example, with a 32 KB transfer), when the first qtd gets a |
| 455 | * short read the second must be removed by hand. |
| 456 | */ |
| 457 | if (last_status == -EINPROGRESS) { |
| 458 | last_status = qtd_copy_status(ehci, urb, |
| 459 | qtd->length, token); |
| 460 | if (last_status == -EREMOTEIO |
| 461 | && (qtd->hw_alt_next |
| 462 | & EHCI_LIST_END(ehci))) |
| 463 | last_status = -EINPROGRESS; |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 464 | |
| 465 | /* As part of low/full-speed endpoint-halt processing |
| 466 | * we must clear the TT buffer (11.17.5). |
| 467 | */ |
| 468 | if (unlikely(last_status != -EINPROGRESS && |
Alan Stern | c2f6595 | 2009-11-18 11:37:15 -0500 | [diff] [blame] | 469 | last_status != -EREMOTEIO)) { |
| 470 | /* The TT's in some hubs malfunction when they |
| 471 | * receive this request following a STALL (they |
| 472 | * stop sending isochronous packets). Since a |
| 473 | * STALL can't leave the TT buffer in a busy |
| 474 | * state (if you believe Figures 11-48 - 11-51 |
| 475 | * in the USB 2.0 spec), we won't clear the TT |
| 476 | * buffer in this case. Strictly speaking this |
| 477 | * is a violation of the spec. |
| 478 | */ |
| 479 | if (last_status != -EPIPE) |
| 480 | ehci_clear_tt_buffer(ehci, qh, urb, |
| 481 | token); |
| 482 | } |
Alan Stern | b0d9efb | 2007-08-21 15:39:21 -0400 | [diff] [blame] | 483 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 485 | /* if we're removing something not at the queue head, |
| 486 | * patch the hardware queue pointer. |
| 487 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | if (stopped && qtd->qtd_list.prev != &qh->qtd_list) { |
| 489 | last = list_entry (qtd->qtd_list.prev, |
| 490 | struct ehci_qtd, qtd_list); |
| 491 | last->hw_next = qtd->hw_next; |
| 492 | } |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 493 | |
| 494 | /* remove qtd; it's recycled after possible urb completion */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | list_del (&qtd->qtd_list); |
| 496 | last = qtd; |
Alan Stern | a2c2706 | 2009-02-10 10:16:58 -0500 | [diff] [blame] | 497 | |
| 498 | /* reinit the xacterr counter for the next qtd */ |
Alan Stern | ef4638f | 2009-07-31 10:41:40 -0400 | [diff] [blame] | 499 | qh->xacterrs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | } |
| 501 | |
| 502 | /* last urb's completion might still need calling */ |
| 503 | if (likely (last != NULL)) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 504 | ehci_urb_done(ehci, last->urb, last_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | ehci_qtd_free (ehci, last); |
| 506 | } |
| 507 | |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 508 | /* Do we need to rescan for URBs dequeued during a giveback? */ |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 509 | if (unlikely(qh->dequeue_during_giveback)) { |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 510 | /* If the QH is already unlinked, do the rescan now. */ |
| 511 | if (state == QH_STATE_IDLE) |
| 512 | goto rescan; |
| 513 | |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 514 | /* Otherwise the caller must unlink the QH. */ |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 515 | } |
| 516 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | /* restore original state; caller must unlink or relink */ |
| 518 | qh->qh_state = state; |
| 519 | |
| 520 | /* be sure the hardware's done with the qh before refreshing |
| 521 | * it after fault cleanup, or recovering from silicon wrongly |
| 522 | * overlaying the dummy qtd (which reduces DMA chatter). |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 523 | * |
| 524 | * We won't refresh a QH that's linked (after the HC |
| 525 | * stopped the queue). That avoids a race: |
| 526 | * - HC reads first part of QH; |
| 527 | * - CPU updates that first part and the token; |
| 528 | * - HC reads rest of that QH, including token |
| 529 | * Result: HC gets an inconsistent image, and then |
| 530 | * DMAs to/from the wrong memory (corrupting it). |
| 531 | * |
| 532 | * That should be rare for interrupt transfers, |
| 533 | * except maybe high bandwidth ... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | */ |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 535 | if (stopped != 0 || hw->hw_qtd_next == EHCI_LIST_END(ehci)) |
| 536 | qh->exception = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 538 | /* Let the caller know if the QH needs to be unlinked. */ |
| 539 | return qh->exception; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | } |
| 541 | |
| 542 | /*-------------------------------------------------------------------------*/ |
| 543 | |
| 544 | // high bandwidth multiplier, as encoded in highspeed endpoint descriptors |
| 545 | #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03)) |
| 546 | // ... and packet size, for any kind of endpoint descriptor |
| 547 | #define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff) |
| 548 | |
| 549 | /* |
| 550 | * reverse of qh_urb_transaction: free a list of TDs. |
| 551 | * used for cleanup after errors, before HC sees an URB's TDs. |
| 552 | */ |
| 553 | static void qtd_list_free ( |
| 554 | struct ehci_hcd *ehci, |
| 555 | struct urb *urb, |
| 556 | struct list_head *qtd_list |
| 557 | ) { |
| 558 | struct list_head *entry, *temp; |
| 559 | |
| 560 | list_for_each_safe (entry, temp, qtd_list) { |
| 561 | struct ehci_qtd *qtd; |
| 562 | |
| 563 | qtd = list_entry (entry, struct ehci_qtd, qtd_list); |
| 564 | list_del (&qtd->qtd_list); |
| 565 | ehci_qtd_free (ehci, qtd); |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | /* |
| 570 | * create a list of filled qtds for this URB; won't link into qh. |
| 571 | */ |
| 572 | static struct list_head * |
| 573 | qh_urb_transaction ( |
| 574 | struct ehci_hcd *ehci, |
| 575 | struct urb *urb, |
| 576 | struct list_head *head, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 577 | gfp_t flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | ) { |
| 579 | struct ehci_qtd *qtd, *qtd_prev; |
| 580 | dma_addr_t buf; |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 581 | int len, this_sg_len, maxpacket; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | int is_input; |
| 583 | u32 token; |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 584 | int i; |
| 585 | struct scatterlist *sg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
| 587 | /* |
| 588 | * URBs map to sequences of QTDs: one logical transaction |
| 589 | */ |
| 590 | qtd = ehci_qtd_alloc (ehci, flags); |
| 591 | if (unlikely (!qtd)) |
| 592 | return NULL; |
| 593 | list_add_tail (&qtd->qtd_list, head); |
| 594 | qtd->urb = urb; |
| 595 | |
| 596 | token = QTD_STS_ACTIVE; |
| 597 | token |= (EHCI_TUNE_CERR << 10); |
| 598 | /* for split transactions, SplitXState initialized to zero */ |
| 599 | |
| 600 | len = urb->transfer_buffer_length; |
| 601 | is_input = usb_pipein (urb->pipe); |
| 602 | if (usb_pipecontrol (urb->pipe)) { |
| 603 | /* SETUP pid */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 604 | qtd_fill(ehci, qtd, urb->setup_dma, |
| 605 | sizeof (struct usb_ctrlrequest), |
| 606 | token | (2 /* "setup" */ << 8), 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
| 608 | /* ... and always at least one more pid */ |
| 609 | token ^= QTD_TOGGLE; |
| 610 | qtd_prev = qtd; |
| 611 | qtd = ehci_qtd_alloc (ehci, flags); |
| 612 | if (unlikely (!qtd)) |
| 613 | goto cleanup; |
| 614 | qtd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 615 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | list_add_tail (&qtd->qtd_list, head); |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 617 | |
| 618 | /* for zero length DATA stages, STATUS is always IN */ |
| 619 | if (len == 0) |
| 620 | token |= (1 /* "in" */ << 8); |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 621 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | |
| 623 | /* |
| 624 | * data transfer stage: buffer setup |
| 625 | */ |
Clemens Ladisch | bc677d5 | 2011-12-03 23:41:31 +0100 | [diff] [blame] | 626 | i = urb->num_mapped_sgs; |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 627 | if (len > 0 && i > 0) { |
Matthew Wilcox | 910f8d0 | 2010-05-01 12:20:01 -0600 | [diff] [blame] | 628 | sg = urb->sg; |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 629 | buf = sg_dma_address(sg); |
| 630 | |
| 631 | /* urb->transfer_buffer_length may be smaller than the |
| 632 | * size of the scatterlist (or vice versa) |
| 633 | */ |
| 634 | this_sg_len = min_t(int, sg_dma_len(sg), len); |
| 635 | } else { |
| 636 | sg = NULL; |
| 637 | buf = urb->transfer_dma; |
| 638 | this_sg_len = len; |
| 639 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 641 | if (is_input) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | token |= (1 /* "in" */ << 8); |
| 643 | /* else it's already initted to "out" pid (0 << 8) */ |
| 644 | |
| 645 | maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input)); |
| 646 | |
| 647 | /* |
| 648 | * buffer gets wrapped in one or more qtds; |
| 649 | * last one may be "short" (including zero len) |
| 650 | * and may serve as a control status ack |
| 651 | */ |
| 652 | for (;;) { |
| 653 | int this_qtd_len; |
| 654 | |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 655 | this_qtd_len = qtd_fill(ehci, qtd, buf, this_sg_len, token, |
| 656 | maxpacket); |
| 657 | this_sg_len -= this_qtd_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | len -= this_qtd_len; |
| 659 | buf += this_qtd_len; |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 660 | |
| 661 | /* |
| 662 | * short reads advance to a "magic" dummy instead of the next |
| 663 | * qtd ... that forces the queue to stop, for manual cleanup. |
| 664 | * (this will usually be overridden later.) |
| 665 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | if (is_input) |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 667 | qtd->hw_alt_next = ehci->async->hw->hw_alt_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | |
| 669 | /* qh makes control packets use qtd toggle; maybe switch it */ |
| 670 | if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0) |
| 671 | token ^= QTD_TOGGLE; |
| 672 | |
Alan Stern | 40f8db8 | 2009-11-06 12:29:40 -0500 | [diff] [blame] | 673 | if (likely(this_sg_len <= 0)) { |
| 674 | if (--i <= 0 || len <= 0) |
| 675 | break; |
| 676 | sg = sg_next(sg); |
| 677 | buf = sg_dma_address(sg); |
| 678 | this_sg_len = min_t(int, sg_dma_len(sg), len); |
| 679 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
| 681 | qtd_prev = qtd; |
| 682 | qtd = ehci_qtd_alloc (ehci, flags); |
| 683 | if (unlikely (!qtd)) |
| 684 | goto cleanup; |
| 685 | qtd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 686 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | list_add_tail (&qtd->qtd_list, head); |
| 688 | } |
| 689 | |
David Brownell | a082b5c | 2008-04-10 14:21:06 -0700 | [diff] [blame] | 690 | /* |
| 691 | * unless the caller requires manual cleanup after short reads, |
| 692 | * have the alt_next mechanism keep the queue running after the |
| 693 | * last data qtd (the only one, for control and most other cases). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | */ |
| 695 | if (likely ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0 |
| 696 | || usb_pipecontrol (urb->pipe))) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 697 | qtd->hw_alt_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
| 699 | /* |
| 700 | * control requests may need a terminating data "status" ack; |
Ming Lei | 9a971dd | 2011-09-05 21:05:56 +0800 | [diff] [blame] | 701 | * other OUT ones may need a terminating short packet |
| 702 | * (zero length). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | */ |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 704 | if (likely (urb->transfer_buffer_length != 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | int one_more = 0; |
| 706 | |
| 707 | if (usb_pipecontrol (urb->pipe)) { |
| 708 | one_more = 1; |
| 709 | token ^= 0x0100; /* "in" <--> "out" */ |
| 710 | token |= QTD_TOGGLE; /* force DATA1 */ |
Ming Lei | 9a971dd | 2011-09-05 21:05:56 +0800 | [diff] [blame] | 711 | } else if (usb_pipeout(urb->pipe) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | && (urb->transfer_flags & URB_ZERO_PACKET) |
| 713 | && !(urb->transfer_buffer_length % maxpacket)) { |
| 714 | one_more = 1; |
| 715 | } |
| 716 | if (one_more) { |
| 717 | qtd_prev = qtd; |
| 718 | qtd = ehci_qtd_alloc (ehci, flags); |
| 719 | if (unlikely (!qtd)) |
| 720 | goto cleanup; |
| 721 | qtd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 722 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | list_add_tail (&qtd->qtd_list, head); |
| 724 | |
| 725 | /* never any data in such packets */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 726 | qtd_fill(ehci, qtd, 0, 0, token, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | } |
| 728 | } |
| 729 | |
| 730 | /* by default, enable interrupt on urb completion */ |
| 731 | if (likely (!(urb->transfer_flags & URB_NO_INTERRUPT))) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 732 | qtd->hw_token |= cpu_to_hc32(ehci, QTD_IOC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | return head; |
| 734 | |
| 735 | cleanup: |
| 736 | qtd_list_free (ehci, urb, head); |
| 737 | return NULL; |
| 738 | } |
| 739 | |
| 740 | /*-------------------------------------------------------------------------*/ |
| 741 | |
| 742 | // Would be best to create all qh's from config descriptors, |
| 743 | // when each interface/altsetting is established. Unlink |
| 744 | // any previous qh and cancel its urbs first; endpoints are |
| 745 | // implicitly reset then (data toggle too). |
| 746 | // That'd mean updating how usbcore talks to HCDs. (2.7?) |
| 747 | |
| 748 | |
| 749 | /* |
| 750 | * Each QH holds a qtd list; a QH is used for everything except iso. |
| 751 | * |
| 752 | * For interrupt urbs, the scheduler must set the microframe scheduling |
| 753 | * mask(s) each time the QH gets scheduled. For highspeed, that's |
| 754 | * just one microframe in the s-mask. For split interrupt transactions |
| 755 | * there are additional complications: c-mask, maybe FSTNs. |
| 756 | */ |
| 757 | static struct ehci_qh * |
| 758 | qh_make ( |
| 759 | struct ehci_hcd *ehci, |
| 760 | struct urb *urb, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 761 | gfp_t flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | ) { |
| 763 | struct ehci_qh *qh = ehci_qh_alloc (ehci, flags); |
| 764 | u32 info1 = 0, info2 = 0; |
| 765 | int is_input, type; |
| 766 | int maxp = 0; |
David Brownell | 340ba5f | 2007-12-19 11:30:39 -0800 | [diff] [blame] | 767 | struct usb_tt *tt = urb->dev->tt; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 768 | struct ehci_qh_hw *hw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
| 770 | if (!qh) |
| 771 | return qh; |
| 772 | |
| 773 | /* |
| 774 | * init endpoint/device data for this QH |
| 775 | */ |
| 776 | info1 |= usb_pipeendpoint (urb->pipe) << 8; |
| 777 | info1 |= usb_pipedevice (urb->pipe) << 0; |
| 778 | |
| 779 | is_input = usb_pipein (urb->pipe); |
| 780 | type = usb_pipetype (urb->pipe); |
| 781 | maxp = usb_maxpacket (urb->dev, urb->pipe, !is_input); |
| 782 | |
David Brownell | caa9ef6 | 2008-02-08 15:08:44 -0800 | [diff] [blame] | 783 | /* 1024 byte maxpacket is a hardware ceiling. High bandwidth |
| 784 | * acts like up to 3KB, but is built from smaller packets. |
| 785 | */ |
| 786 | if (max_packet(maxp) > 1024) { |
| 787 | ehci_dbg(ehci, "bogus qh maxpacket %d\n", max_packet(maxp)); |
| 788 | goto done; |
| 789 | } |
| 790 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | /* Compute interrupt scheduling parameters just once, and save. |
| 792 | * - allowing for high bandwidth, how many nsec/uframe are used? |
| 793 | * - split transactions need a second CSPLIT uframe; same question |
| 794 | * - splits also need a schedule gap (for full/low speed I/O) |
| 795 | * - qh has a polling interval |
| 796 | * |
| 797 | * For control/bulk requests, the HC or TT handles these. |
| 798 | */ |
| 799 | if (type == PIPE_INTERRUPT) { |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 800 | qh->ps.usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH, |
David Brownell | 340ba5f | 2007-12-19 11:30:39 -0800 | [diff] [blame] | 801 | is_input, 0, |
| 802 | hb_mult(maxp) * max_packet(maxp))); |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 803 | qh->ps.phase = NO_FRAME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | |
| 805 | if (urb->dev->speed == USB_SPEED_HIGH) { |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 806 | qh->ps.c_usecs = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | qh->gap_uf = 0; |
| 808 | |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 809 | if (urb->interval > 1 && urb->interval < 8) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | /* NOTE interval 2 or 4 uframes could work. |
| 811 | * But interval 1 scheduling is simpler, and |
| 812 | * includes high bandwidth. |
| 813 | */ |
Alan Stern | 1b9a38b | 2010-01-08 11:17:55 -0500 | [diff] [blame] | 814 | urb->interval = 1; |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 815 | } else if (urb->interval > ehci->periodic_size << 3) { |
| 816 | urb->interval = ehci->periodic_size << 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | } |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 818 | qh->ps.period = urb->interval >> 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | } else { |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 820 | int think_time; |
| 821 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | /* gap is f(FS/LS transfer times) */ |
| 823 | qh->gap_uf = 1 + usb_calc_bus_time (urb->dev->speed, |
| 824 | is_input, 0, maxp) / (125 * 1000); |
| 825 | |
| 826 | /* FIXME this just approximates SPLIT/CSPLIT times */ |
| 827 | if (is_input) { // SPLIT, gap, CSPLIT+DATA |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 828 | qh->ps.c_usecs = qh->ps.usecs + HS_USECS(0); |
| 829 | qh->ps.usecs = HS_USECS(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | } else { // SPLIT+DATA, gap, CSPLIT |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 831 | qh->ps.usecs += HS_USECS(1); |
| 832 | qh->ps.c_usecs = HS_USECS(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | } |
| 834 | |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 835 | think_time = tt ? tt->think_time : 0; |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 836 | qh->ps.tt_usecs = NS_TO_US(think_time + |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 837 | usb_calc_bus_time (urb->dev->speed, |
| 838 | is_input, 0, max_packet (maxp))); |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 839 | if (urb->interval > ehci->periodic_size) |
| 840 | urb->interval = ehci->periodic_size; |
| 841 | qh->ps.period = urb->interval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | } |
| 843 | } |
| 844 | |
| 845 | /* support for tt scheduling, and access to toggles */ |
Alan Stern | ffa0248 | 2013-10-11 11:29:03 -0400 | [diff] [blame^] | 846 | qh->ps.udev = urb->dev; |
| 847 | qh->ps.ep = urb->ep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | |
| 849 | /* using TT? */ |
| 850 | switch (urb->dev->speed) { |
| 851 | case USB_SPEED_LOW: |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 852 | info1 |= QH_LOW_SPEED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | /* FALL THROUGH */ |
| 854 | |
| 855 | case USB_SPEED_FULL: |
| 856 | /* EPS 0 means "full" */ |
| 857 | if (type != PIPE_INTERRUPT) |
| 858 | info1 |= (EHCI_TUNE_RL_TT << 28); |
| 859 | if (type == PIPE_CONTROL) { |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 860 | info1 |= QH_CONTROL_EP; /* for TT */ |
| 861 | info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | } |
| 863 | info1 |= maxp << 16; |
| 864 | |
| 865 | info2 |= (EHCI_TUNE_MULT_TT << 30); |
Kumar Gala | 8cd42e9 | 2006-01-20 13:57:52 -0800 | [diff] [blame] | 866 | |
| 867 | /* Some Freescale processors have an erratum in which the |
| 868 | * port number in the queue head was 0..N-1 instead of 1..N. |
| 869 | */ |
| 870 | if (ehci_has_fsl_portno_bug(ehci)) |
| 871 | info2 |= (urb->dev->ttport-1) << 23; |
| 872 | else |
| 873 | info2 |= urb->dev->ttport << 23; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | |
| 875 | /* set the address of the TT; for TDI's integrated |
| 876 | * root hub tt, leave it zeroed. |
| 877 | */ |
David Brownell | 340ba5f | 2007-12-19 11:30:39 -0800 | [diff] [blame] | 878 | if (tt && tt->hub != ehci_to_hcd(ehci)->self.root_hub) |
| 879 | info2 |= tt->hub->devnum << 16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
| 881 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */ |
| 882 | |
| 883 | break; |
| 884 | |
| 885 | case USB_SPEED_HIGH: /* no TT involved */ |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 886 | info1 |= QH_HIGH_SPEED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | if (type == PIPE_CONTROL) { |
| 888 | info1 |= (EHCI_TUNE_RL_HS << 28); |
| 889 | info1 |= 64 << 16; /* usb2 fixed maxpacket */ |
Alan Stern | 4c53de7 | 2012-07-11 11:21:32 -0400 | [diff] [blame] | 890 | info1 |= QH_TOGGLE_CTL; /* toggle from qtd */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | info2 |= (EHCI_TUNE_MULT_HS << 30); |
| 892 | } else if (type == PIPE_BULK) { |
| 893 | info1 |= (EHCI_TUNE_RL_HS << 28); |
David Brownell | caa9ef6 | 2008-02-08 15:08:44 -0800 | [diff] [blame] | 894 | /* The USB spec says that high speed bulk endpoints |
| 895 | * always use 512 byte maxpacket. But some device |
| 896 | * vendors decided to ignore that, and MSFT is happy |
| 897 | * to help them do so. So now people expect to use |
| 898 | * such nonconformant devices with Linux too; sigh. |
| 899 | */ |
| 900 | info1 |= max_packet(maxp) << 16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | info2 |= (EHCI_TUNE_MULT_HS << 30); |
| 902 | } else { /* PIPE_INTERRUPT */ |
| 903 | info1 |= max_packet (maxp) << 16; |
| 904 | info2 |= hb_mult (maxp) << 30; |
| 905 | } |
| 906 | break; |
| 907 | default: |
Greg Kroah-Hartman | 82491c2 | 2012-05-01 21:33:35 -0700 | [diff] [blame] | 908 | ehci_dbg(ehci, "bogus dev %p speed %d\n", urb->dev, |
| 909 | urb->dev->speed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | done: |
Alan Stern | c83e1a9 | 2012-07-11 11:21:25 -0400 | [diff] [blame] | 911 | qh_destroy(ehci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | return NULL; |
| 913 | } |
| 914 | |
| 915 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */ |
| 916 | |
Alan Stern | c1fdb68 | 2013-03-22 13:30:43 -0400 | [diff] [blame] | 917 | /* init as live, toggle clear */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | qh->qh_state = QH_STATE_IDLE; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 919 | hw = qh->hw; |
| 920 | hw->hw_info1 = cpu_to_hc32(ehci, info1); |
| 921 | hw->hw_info2 = cpu_to_hc32(ehci, info2); |
Alan Stern | e04f5f7 | 2011-07-19 14:01:23 -0400 | [diff] [blame] | 922 | qh->is_out = !is_input; |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 923 | usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | return qh; |
| 925 | } |
| 926 | |
| 927 | /*-------------------------------------------------------------------------*/ |
| 928 | |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 929 | static void enable_async(struct ehci_hcd *ehci) |
| 930 | { |
| 931 | if (ehci->async_count++) |
| 932 | return; |
| 933 | |
| 934 | /* Stop waiting to turn off the async schedule */ |
| 935 | ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_DISABLE_ASYNC); |
| 936 | |
| 937 | /* Don't start the schedule until ASS is 0 */ |
| 938 | ehci_poll_ASS(ehci); |
Alan Stern | 18aafe6 | 2012-07-11 11:23:04 -0400 | [diff] [blame] | 939 | turn_on_io_watchdog(ehci); |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 940 | } |
| 941 | |
| 942 | static void disable_async(struct ehci_hcd *ehci) |
| 943 | { |
| 944 | if (--ehci->async_count) |
| 945 | return; |
| 946 | |
Alan Stern | 6e01875 | 2013-03-22 13:31:45 -0400 | [diff] [blame] | 947 | /* The async schedule and unlink lists are supposed to be empty */ |
| 948 | WARN_ON(ehci->async->qh_next.qh || !list_empty(&ehci->async_unlink) || |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 949 | !list_empty(&ehci->async_idle)); |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 950 | |
| 951 | /* Don't turn off the schedule until ASS is 1 */ |
| 952 | ehci_poll_ASS(ehci); |
| 953 | } |
| 954 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | /* move qh (and its qtds) onto async queue; maybe enable queue. */ |
| 956 | |
| 957 | static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh) |
| 958 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 959 | __hc32 dma = QH_NEXT(ehci, qh->qh_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | struct ehci_qh *head; |
| 961 | |
Alan Stern | 914b701 | 2009-06-29 10:47:30 -0400 | [diff] [blame] | 962 | /* Don't link a QH if there's a Clear-TT-Buffer pending */ |
| 963 | if (unlikely(qh->clearing_tt)) |
| 964 | return; |
| 965 | |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 966 | WARN_ON(qh->qh_state != QH_STATE_IDLE); |
| 967 | |
Alan Stern | a455212d | 2009-06-11 14:56:22 -0400 | [diff] [blame] | 968 | /* clear halt and/or toggle; and maybe recover from silicon quirk */ |
Alan Stern | 3a44494 | 2009-08-19 12:22:06 -0400 | [diff] [blame] | 969 | qh_refresh(ehci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
| 971 | /* splice right after start */ |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 972 | head = ehci->async; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | qh->qh_next = head->qh_next; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 974 | qh->hw->hw_next = head->hw->hw_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | wmb (); |
| 976 | |
| 977 | head->qh_next.qh = qh; |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 978 | head->hw->hw_next = dma; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
| 980 | qh->qh_state = QH_STATE_LINKED; |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 981 | qh->xacterrs = 0; |
| 982 | qh->exception = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | /* qtd completions reported later by interrupt */ |
Alan Stern | 3144661 | 2012-07-11 11:22:21 -0400 | [diff] [blame] | 984 | |
| 985 | enable_async(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | } |
| 987 | |
| 988 | /*-------------------------------------------------------------------------*/ |
| 989 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | /* |
| 991 | * For control/bulk/interrupt, return QH with these TDs appended. |
| 992 | * Allocates and initializes the QH if necessary. |
| 993 | * Returns null if it can't allocate a QH it needs to. |
| 994 | * If the QH has TDs (urbs) already, that's great. |
| 995 | */ |
| 996 | static struct ehci_qh *qh_append_tds ( |
| 997 | struct ehci_hcd *ehci, |
| 998 | struct urb *urb, |
| 999 | struct list_head *qtd_list, |
| 1000 | int epnum, |
| 1001 | void **ptr |
| 1002 | ) |
| 1003 | { |
| 1004 | struct ehci_qh *qh = NULL; |
Al Viro | fd05e72 | 2008-04-28 07:00:16 +0100 | [diff] [blame] | 1005 | __hc32 qh_addr_mask = cpu_to_hc32(ehci, 0x7f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | |
| 1007 | qh = (struct ehci_qh *) *ptr; |
| 1008 | if (unlikely (qh == NULL)) { |
| 1009 | /* can't sleep here, we have ehci->lock... */ |
| 1010 | qh = qh_make (ehci, urb, GFP_ATOMIC); |
| 1011 | *ptr = qh; |
| 1012 | } |
| 1013 | if (likely (qh != NULL)) { |
| 1014 | struct ehci_qtd *qtd; |
| 1015 | |
| 1016 | if (unlikely (list_empty (qtd_list))) |
| 1017 | qtd = NULL; |
| 1018 | else |
| 1019 | qtd = list_entry (qtd_list->next, struct ehci_qtd, |
| 1020 | qtd_list); |
| 1021 | |
| 1022 | /* control qh may need patching ... */ |
| 1023 | if (unlikely (epnum == 0)) { |
| 1024 | |
| 1025 | /* usb_reset_device() briefly reverts to address 0 */ |
| 1026 | if (usb_pipedevice (urb->pipe) == 0) |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 1027 | qh->hw->hw_info1 &= ~qh_addr_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | } |
| 1029 | |
| 1030 | /* just one way to queue requests: swap with the dummy qtd. |
| 1031 | * only hc or qh_refresh() ever modify the overlay. |
| 1032 | */ |
| 1033 | if (likely (qtd != NULL)) { |
| 1034 | struct ehci_qtd *dummy; |
| 1035 | dma_addr_t dma; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1036 | __hc32 token; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | |
| 1038 | /* to avoid racing the HC, use the dummy td instead of |
| 1039 | * the first td of our list (becomes new dummy). both |
| 1040 | * tds stay deactivated until we're done, when the |
| 1041 | * HC is allowed to fetch the old dummy (4.10.2). |
| 1042 | */ |
| 1043 | token = qtd->hw_token; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1044 | qtd->hw_token = HALT_BIT(ehci); |
Ming Lei | 41f05de | 2011-09-05 21:05:58 +0800 | [diff] [blame] | 1045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | dummy = qh->dummy; |
| 1047 | |
| 1048 | dma = dummy->qtd_dma; |
| 1049 | *dummy = *qtd; |
| 1050 | dummy->qtd_dma = dma; |
| 1051 | |
| 1052 | list_del (&qtd->qtd_list); |
| 1053 | list_add (&dummy->qtd_list, qtd_list); |
Luis R. Rodriguez | 7d283ae | 2008-08-06 15:21:26 -0700 | [diff] [blame] | 1054 | list_splice_tail(qtd_list, &qh->qtd_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1056 | ehci_qtd_init(ehci, qtd, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | qh->dummy = qtd; |
| 1058 | |
| 1059 | /* hc must see the new dummy at list end */ |
| 1060 | dma = qtd->qtd_dma; |
| 1061 | qtd = list_entry (qh->qtd_list.prev, |
| 1062 | struct ehci_qtd, qtd_list); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 1063 | qtd->hw_next = QTD_NEXT(ehci, dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | |
| 1065 | /* let the hc process these next qtds */ |
| 1066 | wmb (); |
| 1067 | dummy->hw_token = token; |
| 1068 | |
Alan Stern | c83e1a9 | 2012-07-11 11:21:25 -0400 | [diff] [blame] | 1069 | urb->hcpriv = qh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | } |
| 1071 | } |
| 1072 | return qh; |
| 1073 | } |
| 1074 | |
| 1075 | /*-------------------------------------------------------------------------*/ |
| 1076 | |
| 1077 | static int |
| 1078 | submit_async ( |
| 1079 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | struct urb *urb, |
| 1081 | struct list_head *qtd_list, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 1082 | gfp_t mem_flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | int epnum; |
| 1085 | unsigned long flags; |
| 1086 | struct ehci_qh *qh = NULL; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1087 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1089 | epnum = urb->ep->desc.bEndpointAddress; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | |
| 1091 | #ifdef EHCI_URB_TRACE |
David Daney | eb34a90 | 2011-01-25 09:59:36 -0800 | [diff] [blame] | 1092 | { |
| 1093 | struct ehci_qtd *qtd; |
| 1094 | qtd = list_entry(qtd_list->next, struct ehci_qtd, qtd_list); |
| 1095 | ehci_dbg(ehci, |
| 1096 | "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n", |
| 1097 | __func__, urb->dev->devpath, urb, |
| 1098 | epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out", |
| 1099 | urb->transfer_buffer_length, |
| 1100 | qtd, urb->ep->hcpriv); |
| 1101 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | #endif |
| 1103 | |
| 1104 | spin_lock_irqsave (&ehci->lock, flags); |
Alan Stern | 541c7d4 | 2010-06-22 16:39:10 -0400 | [diff] [blame] | 1105 | if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) { |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1106 | rc = -ESHUTDOWN; |
| 1107 | goto done; |
| 1108 | } |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1109 | rc = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb); |
| 1110 | if (unlikely(rc)) |
| 1111 | goto done; |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1112 | |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1113 | qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1114 | if (unlikely(qh == NULL)) { |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 1115 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1116 | rc = -ENOMEM; |
| 1117 | goto done; |
| 1118 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | |
| 1120 | /* Control/bulk operations through TTs don't need scheduling, |
| 1121 | * the HC and TT handle it when the TT has a buffer ready. |
| 1122 | */ |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1123 | if (likely (qh->qh_state == QH_STATE_IDLE)) |
Alan Stern | 7a0f0d9 | 2009-07-31 10:40:22 -0400 | [diff] [blame] | 1124 | qh_link_async(ehci, qh); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1125 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | spin_unlock_irqrestore (&ehci->lock, flags); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1127 | if (unlikely (qh == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | qtd_list_free (ehci, urb, qtd_list); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 1129 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1130 | } |
| 1131 | |
| 1132 | /*-------------------------------------------------------------------------*/ |
Jack Pham | 726a85c | 2013-08-13 13:40:13 -0700 | [diff] [blame] | 1133 | #ifdef CONFIG_USB_HCD_TEST_MODE |
Manu Gautam | 9841f37 | 2013-08-08 16:49:24 -0700 | [diff] [blame] | 1134 | /* |
| 1135 | * This function creates the qtds and submits them for the |
| 1136 | * SINGLE_STEP_SET_FEATURE Test. |
| 1137 | * This is done in two parts: first SETUP req for GetDesc is sent then |
| 1138 | * 15 seconds later, the IN stage for GetDesc starts to req data from dev |
| 1139 | * |
| 1140 | * is_setup : i/p arguement decides which of the two stage needs to be |
| 1141 | * performed; TRUE - SETUP and FALSE - IN+STATUS |
| 1142 | * Returns 0 if success |
| 1143 | */ |
| 1144 | static int submit_single_step_set_feature( |
| 1145 | struct usb_hcd *hcd, |
| 1146 | struct urb *urb, |
| 1147 | int is_setup |
| 1148 | ) { |
| 1149 | struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
| 1150 | struct list_head qtd_list; |
| 1151 | struct list_head *head; |
| 1152 | |
| 1153 | struct ehci_qtd *qtd, *qtd_prev; |
| 1154 | dma_addr_t buf; |
| 1155 | int len, maxpacket; |
| 1156 | u32 token; |
| 1157 | |
| 1158 | INIT_LIST_HEAD(&qtd_list); |
| 1159 | head = &qtd_list; |
| 1160 | |
| 1161 | /* URBs map to sequences of QTDs: one logical transaction */ |
| 1162 | qtd = ehci_qtd_alloc(ehci, GFP_KERNEL); |
| 1163 | if (unlikely(!qtd)) |
| 1164 | return -1; |
| 1165 | list_add_tail(&qtd->qtd_list, head); |
| 1166 | qtd->urb = urb; |
| 1167 | |
| 1168 | token = QTD_STS_ACTIVE; |
| 1169 | token |= (EHCI_TUNE_CERR << 10); |
| 1170 | |
| 1171 | len = urb->transfer_buffer_length; |
| 1172 | /* |
| 1173 | * Check if the request is to perform just the SETUP stage (getDesc) |
| 1174 | * as in SINGLE_STEP_SET_FEATURE test, DATA stage (IN) happens |
| 1175 | * 15 secs after the setup |
| 1176 | */ |
| 1177 | if (is_setup) { |
| 1178 | /* SETUP pid */ |
| 1179 | qtd_fill(ehci, qtd, urb->setup_dma, |
| 1180 | sizeof(struct usb_ctrlrequest), |
| 1181 | token | (2 /* "setup" */ << 8), 8); |
| 1182 | |
| 1183 | submit_async(ehci, urb, &qtd_list, GFP_ATOMIC); |
| 1184 | return 0; /*Return now; we shall come back after 15 seconds*/ |
| 1185 | } |
| 1186 | |
| 1187 | /* |
| 1188 | * IN: data transfer stage: buffer setup : start the IN txn phase for |
| 1189 | * the get_Desc SETUP which was sent 15seconds back |
| 1190 | */ |
| 1191 | token ^= QTD_TOGGLE; /*We need to start IN with DATA-1 Pid-sequence*/ |
| 1192 | buf = urb->transfer_dma; |
| 1193 | |
| 1194 | token |= (1 /* "in" */ << 8); /*This is IN stage*/ |
| 1195 | |
| 1196 | maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, 0)); |
| 1197 | |
| 1198 | qtd_fill(ehci, qtd, buf, len, token, maxpacket); |
| 1199 | |
| 1200 | /* |
| 1201 | * Our IN phase shall always be a short read; so keep the queue running |
| 1202 | * and let it advance to the next qtd which zero length OUT status |
| 1203 | */ |
| 1204 | qtd->hw_alt_next = EHCI_LIST_END(ehci); |
| 1205 | |
| 1206 | /* STATUS stage for GetDesc control request */ |
| 1207 | token ^= 0x0100; /* "in" <--> "out" */ |
| 1208 | token |= QTD_TOGGLE; /* force DATA1 */ |
| 1209 | |
| 1210 | qtd_prev = qtd; |
| 1211 | qtd = ehci_qtd_alloc(ehci, GFP_ATOMIC); |
| 1212 | if (unlikely(!qtd)) |
| 1213 | goto cleanup; |
| 1214 | qtd->urb = urb; |
| 1215 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
| 1216 | list_add_tail(&qtd->qtd_list, head); |
| 1217 | |
| 1218 | /* dont fill any data in such packets */ |
| 1219 | qtd_fill(ehci, qtd, 0, 0, token, 0); |
| 1220 | |
| 1221 | /* by default, enable interrupt on urb completion */ |
| 1222 | if (likely(!(urb->transfer_flags & URB_NO_INTERRUPT))) |
| 1223 | qtd->hw_token |= cpu_to_hc32(ehci, QTD_IOC); |
| 1224 | |
| 1225 | submit_async(ehci, urb, &qtd_list, GFP_KERNEL); |
| 1226 | |
| 1227 | return 0; |
| 1228 | |
| 1229 | cleanup: |
| 1230 | qtd_list_free(ehci, urb, head); |
| 1231 | return -1; |
| 1232 | } |
Jack Pham | 726a85c | 2013-08-13 13:40:13 -0700 | [diff] [blame] | 1233 | #endif /* CONFIG_USB_HCD_TEST_MODE */ |
Manu Gautam | 9841f37 | 2013-08-08 16:49:24 -0700 | [diff] [blame] | 1234 | |
| 1235 | /*-------------------------------------------------------------------------*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1237 | static void single_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | { |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1239 | struct ehci_qh *prev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1241 | /* Add to the end of the list of QHs waiting for the next IAAD */ |
Alan Stern | 6402c79 | 2013-03-01 10:50:08 -0500 | [diff] [blame] | 1242 | qh->qh_state = QH_STATE_UNLINK_WAIT; |
Alan Stern | 6e01875 | 2013-03-22 13:31:45 -0400 | [diff] [blame] | 1243 | list_add_tail(&qh->unlink_node, &ehci->async_unlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1245 | /* Unlink it from the schedule */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | prev = ehci->async; |
| 1247 | while (prev->qh_next.qh != qh) |
| 1248 | prev = prev->qh_next.qh; |
| 1249 | |
Alek Du | 3807e26 | 2009-07-14 07:23:29 +0800 | [diff] [blame] | 1250 | prev->hw->hw_next = qh->hw->hw_next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | prev->qh_next = qh->qh_next; |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1252 | if (ehci->qh_scan_next == qh) |
| 1253 | ehci->qh_scan_next = qh->qh_next.qh; |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1254 | } |
| 1255 | |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1256 | static void start_iaa_cycle(struct ehci_hcd *ehci) |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1257 | { |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1258 | /* Do nothing if an IAA cycle is already running */ |
| 1259 | if (ehci->iaa_in_progress) |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1260 | return; |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1261 | ehci->iaa_in_progress = true; |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1262 | |
Alan Stern | 391016f | 2009-03-16 14:21:56 -0400 | [diff] [blame] | 1263 | /* If the controller isn't running, we don't have to wait for it */ |
Alan Stern | c0c53db | 2012-07-11 11:21:48 -0400 | [diff] [blame] | 1264 | if (unlikely(ehci->rh_state < EHCI_RH_RUNNING)) { |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1265 | end_unlink_async(ehci); |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1266 | |
| 1267 | /* Otherwise start a new IAA cycle */ |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1268 | } else if (likely(ehci->rh_state == EHCI_RH_RUNNING)) { |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1269 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1270 | /* Make sure the unlinks are all visible to the hardware */ |
| 1271 | wmb(); |
| 1272 | |
| 1273 | ehci_writel(ehci, ehci->command | CMD_IAAD, |
| 1274 | &ehci->regs->command); |
| 1275 | ehci_readl(ehci, &ehci->regs->command); |
| 1276 | ehci_enable_event(ehci, EHCI_HRTIMER_IAA_WATCHDOG, true); |
| 1277 | } |
| 1278 | } |
| 1279 | |
| 1280 | /* the async qh for the qtds being unlinked are now gone from the HC */ |
| 1281 | |
| 1282 | static void end_unlink_async(struct ehci_hcd *ehci) |
| 1283 | { |
| 1284 | struct ehci_qh *qh; |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1285 | bool early_exit; |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1286 | |
| 1287 | if (ehci->has_synopsys_hc_bug) |
| 1288 | ehci_writel(ehci, (u32) ehci->async->qh_dma, |
| 1289 | &ehci->regs->async_next); |
| 1290 | |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1291 | /* The current IAA cycle has ended */ |
| 1292 | ehci->iaa_in_progress = false; |
| 1293 | |
| 1294 | if (list_empty(&ehci->async_unlink)) |
| 1295 | return; |
| 1296 | qh = list_first_entry(&ehci->async_unlink, struct ehci_qh, |
| 1297 | unlink_node); /* QH whose IAA cycle just ended */ |
| 1298 | |
| 1299 | /* |
| 1300 | * If async_unlinking is set then this routine is already running, |
| 1301 | * either on the stack or on another CPU. |
| 1302 | */ |
| 1303 | early_exit = ehci->async_unlinking; |
| 1304 | |
| 1305 | /* If the controller isn't running, process all the waiting QHs */ |
| 1306 | if (ehci->rh_state < EHCI_RH_RUNNING) |
| 1307 | list_splice_tail_init(&ehci->async_unlink, &ehci->async_idle); |
| 1308 | |
| 1309 | /* |
| 1310 | * Intel (?) bug: The HC can write back the overlay region even |
| 1311 | * after the IAA interrupt occurs. In self-defense, always go |
| 1312 | * through two IAA cycles for each QH. |
| 1313 | */ |
| 1314 | else if (qh->qh_state == QH_STATE_UNLINK_WAIT) { |
| 1315 | qh->qh_state = QH_STATE_UNLINK; |
| 1316 | early_exit = true; |
| 1317 | } |
| 1318 | |
| 1319 | /* Otherwise process only the first waiting QH (NVIDIA bug?) */ |
| 1320 | else |
| 1321 | list_move_tail(&qh->unlink_node, &ehci->async_idle); |
| 1322 | |
| 1323 | /* Start a new IAA cycle if any QHs are waiting for it */ |
| 1324 | if (!list_empty(&ehci->async_unlink)) |
| 1325 | start_iaa_cycle(ehci); |
| 1326 | |
| 1327 | /* |
| 1328 | * Don't allow nesting or concurrent calls, |
| 1329 | * or wait for the second IAA cycle for the next QH. |
| 1330 | */ |
| 1331 | if (early_exit) |
| 1332 | return; |
| 1333 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1334 | /* Process the idle QHs */ |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1335 | ehci->async_unlinking = true; |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1336 | while (!list_empty(&ehci->async_idle)) { |
| 1337 | qh = list_first_entry(&ehci->async_idle, struct ehci_qh, |
Alan Stern | 6e01875 | 2013-03-22 13:31:45 -0400 | [diff] [blame] | 1338 | unlink_node); |
| 1339 | list_del(&qh->unlink_node); |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1340 | |
| 1341 | qh->qh_state = QH_STATE_IDLE; |
| 1342 | qh->qh_next.qh = NULL; |
| 1343 | |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame] | 1344 | if (!list_empty(&qh->qtd_list)) |
| 1345 | qh_completions(ehci, qh); |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1346 | if (!list_empty(&qh->qtd_list) && |
| 1347 | ehci->rh_state == EHCI_RH_RUNNING) |
| 1348 | qh_link_async(ehci, qh); |
| 1349 | disable_async(ehci); |
| 1350 | } |
| 1351 | ehci->async_unlinking = false; |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1352 | } |
| 1353 | |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1354 | static void start_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 1355 | |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1356 | static void unlink_empty_async(struct ehci_hcd *ehci) |
| 1357 | { |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1358 | struct ehci_qh *qh; |
| 1359 | struct ehci_qh *qh_to_unlink = NULL; |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1360 | int count = 0; |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1361 | |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1362 | /* Find the last async QH which has been empty for a timer cycle */ |
| 1363 | for (qh = ehci->async->qh_next.qh; qh; qh = qh->qh_next.qh) { |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1364 | if (list_empty(&qh->qtd_list) && |
| 1365 | qh->qh_state == QH_STATE_LINKED) { |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1366 | ++count; |
Alan Stern | afc2c9a | 2013-03-22 13:32:10 -0400 | [diff] [blame] | 1367 | if (qh->unlink_cycle != ehci->async_unlink_cycle) |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1368 | qh_to_unlink = qh; |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1369 | } |
| 1370 | } |
| 1371 | |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1372 | /* If nothing else is being unlinked, unlink the last empty QH */ |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1373 | if (list_empty(&ehci->async_unlink) && qh_to_unlink) { |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1374 | start_unlink_async(ehci, qh_to_unlink); |
| 1375 | --count; |
| 1376 | } |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1377 | |
Alan Stern | 6e0c333 | 2013-01-25 16:54:22 -0500 | [diff] [blame] | 1378 | /* Other QHs will be handled later */ |
| 1379 | if (count > 0) { |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1380 | ehci_enable_event(ehci, EHCI_HRTIMER_ASYNC_UNLINKS, true); |
| 1381 | ++ehci->async_unlink_cycle; |
| 1382 | } |
| 1383 | } |
| 1384 | |
Alan Stern | 2a40f32 | 2013-03-15 14:40:26 -0400 | [diff] [blame] | 1385 | /* The root hub is suspended; unlink all the async QHs */ |
Arnd Bergmann | 70b55c2 | 2013-03-28 21:09:46 +0000 | [diff] [blame] | 1386 | static void __maybe_unused unlink_empty_async_suspended(struct ehci_hcd *ehci) |
Alan Stern | 2a40f32 | 2013-03-15 14:40:26 -0400 | [diff] [blame] | 1387 | { |
| 1388 | struct ehci_qh *qh; |
| 1389 | |
| 1390 | while (ehci->async->qh_next.qh) { |
| 1391 | qh = ehci->async->qh_next.qh; |
| 1392 | WARN_ON(!list_empty(&qh->qtd_list)); |
| 1393 | single_unlink_async(ehci, qh); |
| 1394 | } |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1395 | start_iaa_cycle(ehci); |
Alan Stern | 2a40f32 | 2013-03-15 14:40:26 -0400 | [diff] [blame] | 1396 | } |
| 1397 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1398 | /* makes sure the async qh will become idle */ |
| 1399 | /* caller must own ehci->lock */ |
| 1400 | |
| 1401 | static void start_unlink_async(struct ehci_hcd *ehci, struct ehci_qh *qh) |
| 1402 | { |
Alan Stern | 7bc782d | 2013-03-22 13:31:11 -0400 | [diff] [blame] | 1403 | /* If the QH isn't linked then there's nothing we can do. */ |
| 1404 | if (qh->qh_state != QH_STATE_LINKED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1407 | single_unlink_async(ehci, qh); |
Alan Stern | 214ac7a | 2013-03-22 13:31:58 -0400 | [diff] [blame] | 1408 | start_iaa_cycle(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | } |
| 1410 | |
| 1411 | /*-------------------------------------------------------------------------*/ |
| 1412 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1413 | static void scan_async (struct ehci_hcd *ehci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | { |
| 1415 | struct ehci_qh *qh; |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1416 | bool check_unlinks_later = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1418 | ehci->qh_scan_next = ehci->async->qh_next.qh; |
| 1419 | while (ehci->qh_scan_next) { |
| 1420 | qh = ehci->qh_scan_next; |
| 1421 | ehci->qh_scan_next = qh->qh_next.qh; |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame] | 1422 | |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1423 | /* clean any finished work for this qh */ |
| 1424 | if (!list_empty(&qh->qtd_list)) { |
| 1425 | int temp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1427 | /* |
| 1428 | * Unlinks could happen here; completion reporting |
| 1429 | * drops the lock. That's why ehci->qh_scan_next |
| 1430 | * always holds the next qh to scan; if the next qh |
| 1431 | * gets unlinked then ehci->qh_scan_next is adjusted |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1432 | * in single_unlink_async(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1433 | */ |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1434 | temp = qh_completions(ehci, qh); |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame] | 1435 | if (unlikely(temp)) { |
Alan Stern | 3c273a0 | 2012-07-11 11:22:49 -0400 | [diff] [blame] | 1436 | start_unlink_async(ehci, qh); |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1437 | } else if (list_empty(&qh->qtd_list) |
| 1438 | && qh->qh_state == QH_STATE_LINKED) { |
| 1439 | qh->unlink_cycle = ehci->async_unlink_cycle; |
| 1440 | check_unlinks_later = true; |
Alan Stern | 79bcf7b | 2013-03-22 13:30:56 -0400 | [diff] [blame] | 1441 | } |
Alan Stern | 004c196 | 2011-07-05 12:34:05 -0400 | [diff] [blame] | 1442 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | } |
Alan Stern | 32830f2 | 2012-07-11 11:22:53 -0400 | [diff] [blame] | 1444 | |
| 1445 | /* |
| 1446 | * Unlink empty entries, reducing DMA usage as well |
| 1447 | * as HCD schedule-scanning costs. Delay for any qh |
| 1448 | * we just scanned, there's a not-unusual case that it |
| 1449 | * doesn't stay idle for long. |
| 1450 | */ |
| 1451 | if (check_unlinks_later && ehci->rh_state == EHCI_RH_RUNNING && |
| 1452 | !(ehci->enabled_hrtimer_events & |
| 1453 | BIT(EHCI_HRTIMER_ASYNC_UNLINKS))) { |
| 1454 | ehci_enable_event(ehci, EHCI_HRTIMER_ASYNC_UNLINKS, true); |
| 1455 | ++ehci->async_unlink_cycle; |
| 1456 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | } |