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 | { |
| 90 | /* writes to an active overlay are unsafe */ |
| 91 | BUG_ON(qh->qh_state != QH_STATE_IDLE); |
| 92 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 93 | qh->hw_qtd_next = QTD_NEXT(ehci, qtd->qtd_dma); |
| 94 | qh->hw_alt_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
| 96 | /* Except for control endpoints, we make hardware maintain data |
| 97 | * toggle (like OHCI) ... here (re)initialize the toggle in the QH, |
| 98 | * and set the pseudo-toggle in udev. Only usb_clear_halt() will |
| 99 | * ever clear it. |
| 100 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 101 | if (!(qh->hw_info1 & cpu_to_hc32(ehci, 1 << 14))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | unsigned is_out, epnum; |
| 103 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 104 | is_out = !(qtd->hw_token & cpu_to_hc32(ehci, 1 << 8)); |
| 105 | epnum = (hc32_to_cpup(ehci, &qh->hw_info1) >> 8) & 0x0f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | if (unlikely (!usb_gettoggle (qh->dev, epnum, is_out))) { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 107 | qh->hw_token &= ~cpu_to_hc32(ehci, QTD_TOGGLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | usb_settoggle (qh->dev, epnum, is_out, 1); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | /* HC must see latest qtd and qh data before we clear ACTIVE+HALT */ |
| 113 | wmb (); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 114 | qh->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 | |
| 126 | if (list_empty (&qh->qtd_list)) |
| 127 | qtd = qh->dummy; |
| 128 | else { |
| 129 | qtd = list_entry (qh->qtd_list.next, |
| 130 | struct ehci_qtd, qtd_list); |
| 131 | /* first qtd may already be partially processed */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 132 | if (cpu_to_hc32(ehci, qtd->qtd_dma) == qh->hw_current) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | qtd = NULL; |
| 134 | } |
| 135 | |
| 136 | if (qtd) |
| 137 | qh_update (ehci, qh, qtd); |
| 138 | } |
| 139 | |
| 140 | /*-------------------------------------------------------------------------*/ |
| 141 | |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 142 | static int qtd_copy_status ( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | struct ehci_hcd *ehci, |
| 144 | struct urb *urb, |
| 145 | size_t length, |
| 146 | u32 token |
| 147 | ) |
| 148 | { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 149 | int status = -EINPROGRESS; |
| 150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | /* count IN/OUT bytes, not SETUP (even short packets) */ |
| 152 | if (likely (QTD_PID (token) != 2)) |
| 153 | urb->actual_length += length - QTD_LENGTH (token); |
| 154 | |
| 155 | /* don't modify error codes */ |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 156 | if (unlikely(urb->unlinked)) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 157 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | /* force cleanup after short read; not always an error */ |
| 160 | if (unlikely (IS_SHORT_READ (token))) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 161 | status = -EREMOTEIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
| 163 | /* serious "can't proceed" faults reported by the hardware */ |
| 164 | if (token & QTD_STS_HALT) { |
| 165 | if (token & QTD_STS_BABBLE) { |
| 166 | /* FIXME "must" disable babbling device's port too */ |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 167 | status = -EOVERFLOW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } else if (token & QTD_STS_MMF) { |
| 169 | /* fs/ls interrupt xfer missed the complete-split */ |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 170 | status = -EPROTO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } else if (token & QTD_STS_DBE) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 172 | status = (QTD_PID (token) == 1) /* IN ? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | ? -ENOSR /* hc couldn't read data */ |
| 174 | : -ECOMM; /* hc couldn't write data */ |
| 175 | } else if (token & QTD_STS_XACT) { |
| 176 | /* timeout, bad crc, wrong PID, etc; retried */ |
| 177 | if (QTD_CERR (token)) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 178 | status = -EPIPE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | else { |
| 180 | ehci_dbg (ehci, "devpath %s ep%d%s 3strikes\n", |
| 181 | urb->dev->devpath, |
| 182 | usb_pipeendpoint (urb->pipe), |
| 183 | usb_pipein (urb->pipe) ? "in" : "out"); |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 184 | status = -EPROTO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
| 186 | /* CERR nonzero + no errors + halt --> stall */ |
| 187 | } else if (QTD_CERR (token)) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 188 | status = -EPIPE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | else /* unknown */ |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 190 | status = -EPROTO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
| 192 | ehci_vdbg (ehci, |
| 193 | "dev%d ep%d%s qtd token %08x --> status %d\n", |
| 194 | usb_pipedevice (urb->pipe), |
| 195 | usb_pipeendpoint (urb->pipe), |
| 196 | usb_pipein (urb->pipe) ? "in" : "out", |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 197 | token, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
| 199 | /* if async CSPLIT failed, try cleaning out the TT buffer */ |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 200 | if (status != -EPIPE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | && urb->dev->tt && !usb_pipeint (urb->pipe) |
| 202 | && ((token & QTD_STS_MMF) != 0 |
| 203 | || QTD_CERR(token) == 0) |
| 204 | && (!ehci_is_TDI(ehci) |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 205 | || urb->dev->tt->hub != |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | ehci_to_hcd(ehci)->self.root_hub)) { |
| 207 | #ifdef DEBUG |
| 208 | struct usb_device *tt = urb->dev->tt->hub; |
| 209 | dev_dbg (&tt->dev, |
| 210 | "clear tt buffer port %d, a%d ep%d t%08x\n", |
| 211 | urb->dev->ttport, urb->dev->devnum, |
| 212 | usb_pipeendpoint (urb->pipe), token); |
| 213 | #endif /* DEBUG */ |
| 214 | usb_hub_tt_clear_buffer (urb->dev, urb->pipe); |
| 215 | } |
| 216 | } |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 217 | |
| 218 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | static void |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 222 | ehci_urb_done(struct ehci_hcd *ehci, struct urb *urb, int status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | __releases(ehci->lock) |
| 224 | __acquires(ehci->lock) |
| 225 | { |
| 226 | if (likely (urb->hcpriv != NULL)) { |
| 227 | struct ehci_qh *qh = (struct ehci_qh *) urb->hcpriv; |
| 228 | |
| 229 | /* S-mask in a QH means it's an interrupt urb */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 230 | if ((qh->hw_info2 & cpu_to_hc32(ehci, QH_SMASK)) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
| 232 | /* ... update hc-wide periodic stats (for usbfs) */ |
| 233 | ehci_to_hcd(ehci)->self.bandwidth_int_reqs--; |
| 234 | } |
| 235 | qh_put (qh); |
| 236 | } |
| 237 | |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 238 | if (unlikely(urb->unlinked)) { |
| 239 | COUNT(ehci->stats.unlink); |
| 240 | } else { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 241 | if (likely(status == -EINPROGRESS)) |
| 242 | status = 0; |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 243 | COUNT(ehci->stats.complete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
| 246 | #ifdef EHCI_URB_TRACE |
| 247 | ehci_dbg (ehci, |
| 248 | "%s %s urb %p ep%d%s status %d len %d/%d\n", |
| 249 | __FUNCTION__, urb->dev->devpath, urb, |
| 250 | usb_pipeendpoint (urb->pipe), |
| 251 | usb_pipein (urb->pipe) ? "in" : "out", |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 252 | status, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | urb->actual_length, urb->transfer_buffer_length); |
| 254 | #endif |
| 255 | |
| 256 | /* complete() can reenter this HCD */ |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 257 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | spin_unlock (&ehci->lock); |
Alan Stern | 4a00027 | 2007-08-24 15:42:24 -0400 | [diff] [blame] | 259 | usb_hcd_giveback_urb(ehci_to_hcd(ehci), urb, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | spin_lock (&ehci->lock); |
| 261 | } |
| 262 | |
| 263 | static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 264 | static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 265 | |
| 266 | static void intr_deschedule (struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 267 | static int qh_schedule (struct ehci_hcd *ehci, struct ehci_qh *qh); |
| 268 | |
| 269 | /* |
| 270 | * Process and free completed qtds for a qh, returning URBs to drivers. |
| 271 | * Chases up to qh->hw_current. Returns number of completions called, |
| 272 | * indicating how much "real" work we did. |
| 273 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | static unsigned |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 275 | qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | { |
| 277 | struct ehci_qtd *last = NULL, *end = qh->dummy; |
| 278 | struct list_head *entry, *tmp; |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 279 | int last_status = -EINPROGRESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | int stopped; |
| 281 | unsigned count = 0; |
| 282 | int do_status = 0; |
| 283 | u8 state; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 284 | u32 halt = HALT_BIT(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | if (unlikely (list_empty (&qh->qtd_list))) |
| 287 | return count; |
| 288 | |
| 289 | /* completions (or tasks on other cpus) must never clobber HALT |
| 290 | * till we've gone through and cleaned everything up, even when |
| 291 | * they add urbs to this qh's queue or mark them for unlinking. |
| 292 | * |
| 293 | * NOTE: unlinking expects to be done in queue order. |
| 294 | */ |
| 295 | state = qh->qh_state; |
| 296 | qh->qh_state = QH_STATE_COMPLETING; |
| 297 | stopped = (state == QH_STATE_IDLE); |
| 298 | |
| 299 | /* remove de-activated QTDs from front of queue. |
| 300 | * after faults (including short reads), cleanup this urb |
| 301 | * then let the queue advance. |
| 302 | * if queue is stopped, handles unlinks. |
| 303 | */ |
| 304 | list_for_each_safe (entry, tmp, &qh->qtd_list) { |
| 305 | struct ehci_qtd *qtd; |
| 306 | struct urb *urb; |
| 307 | u32 token = 0; |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 308 | int qtd_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
| 310 | qtd = list_entry (entry, struct ehci_qtd, qtd_list); |
| 311 | urb = qtd->urb; |
| 312 | |
| 313 | /* clean up any state from previous QTD ...*/ |
| 314 | if (last) { |
| 315 | if (likely (last->urb != urb)) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 316 | ehci_urb_done(ehci, last->urb, last_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | count++; |
| 318 | } |
| 319 | ehci_qtd_free (ehci, last); |
| 320 | last = NULL; |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 321 | last_status = -EINPROGRESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | } |
| 323 | |
| 324 | /* ignore urbs submitted during completions we reported */ |
| 325 | if (qtd == end) |
| 326 | break; |
| 327 | |
| 328 | /* hardware copies qtd out of qh overlay */ |
| 329 | rmb (); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 330 | token = hc32_to_cpu(ehci, qtd->hw_token); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
| 332 | /* always clean up qtds the hc de-activated */ |
| 333 | if ((token & QTD_STS_ACTIVE) == 0) { |
| 334 | |
| 335 | if ((token & QTD_STS_HALT) != 0) { |
| 336 | stopped = 1; |
| 337 | |
| 338 | /* magic dummy for some short reads; qh won't advance. |
| 339 | * that silicon quirk can kick in with this dummy too. |
| 340 | */ |
| 341 | } else if (IS_SHORT_READ (token) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 342 | && !(qtd->hw_alt_next |
| 343 | & EHCI_LIST_END(ehci))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | stopped = 1; |
| 345 | goto halt; |
| 346 | } |
| 347 | |
| 348 | /* stop scanning when we reach qtds the hc is using */ |
| 349 | } else if (likely (!stopped |
| 350 | && HC_IS_RUNNING (ehci_to_hcd(ehci)->state))) { |
| 351 | break; |
| 352 | |
| 353 | } else { |
| 354 | stopped = 1; |
| 355 | |
| 356 | if (unlikely (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state))) |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 357 | last_status = -ESHUTDOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
| 359 | /* ignore active urbs unless some previous qtd |
| 360 | * for the urb faulted (including short read) or |
| 361 | * its urb was canceled. we may patch qh or qtds. |
| 362 | */ |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 363 | if (likely(last_status == -EINPROGRESS && |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 364 | !urb->unlinked)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | continue; |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | /* issue status after short control reads */ |
| 368 | if (unlikely (do_status != 0) |
| 369 | && QTD_PID (token) == 0 /* OUT */) { |
| 370 | do_status = 0; |
| 371 | continue; |
| 372 | } |
| 373 | |
| 374 | /* token in overlay may be most current */ |
| 375 | if (state == QH_STATE_IDLE |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 376 | && cpu_to_hc32(ehci, qtd->qtd_dma) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | == qh->hw_current) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 378 | token = hc32_to_cpu(ehci, qh->hw_token); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | |
| 380 | /* force halt for unlinked or blocked qh, so we'll |
| 381 | * patch the qh later and so that completions can't |
| 382 | * activate it while we "know" it's stopped. |
| 383 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 384 | if ((halt & qh->hw_token) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | halt: |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 386 | qh->hw_token |= halt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | wmb (); |
| 388 | } |
| 389 | } |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 390 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | /* remove it from the queue */ |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 392 | qtd_status = qtd_copy_status(ehci, urb, qtd->length, token); |
| 393 | if (unlikely(qtd_status == -EREMOTEIO)) { |
Alan Stern | eb23105 | 2007-08-21 15:40:36 -0400 | [diff] [blame] | 394 | do_status = (!urb->unlinked && |
| 395 | usb_pipecontrol(urb->pipe)); |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 396 | qtd_status = 0; |
Alan Stern | b0d9efb | 2007-08-21 15:39:21 -0400 | [diff] [blame] | 397 | } |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 398 | if (likely(last_status == -EINPROGRESS)) |
| 399 | last_status = qtd_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | |
| 401 | if (stopped && qtd->qtd_list.prev != &qh->qtd_list) { |
| 402 | last = list_entry (qtd->qtd_list.prev, |
| 403 | struct ehci_qtd, qtd_list); |
| 404 | last->hw_next = qtd->hw_next; |
| 405 | } |
| 406 | list_del (&qtd->qtd_list); |
| 407 | last = qtd; |
| 408 | } |
| 409 | |
| 410 | /* last urb's completion might still need calling */ |
| 411 | if (likely (last != NULL)) { |
Alan Stern | 14c04c0 | 2007-08-24 15:40:19 -0400 | [diff] [blame] | 412 | ehci_urb_done(ehci, last->urb, last_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | count++; |
| 414 | ehci_qtd_free (ehci, last); |
| 415 | } |
| 416 | |
| 417 | /* restore original state; caller must unlink or relink */ |
| 418 | qh->qh_state = state; |
| 419 | |
| 420 | /* be sure the hardware's done with the qh before refreshing |
| 421 | * it after fault cleanup, or recovering from silicon wrongly |
| 422 | * overlaying the dummy qtd (which reduces DMA chatter). |
| 423 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 424 | if (stopped != 0 || qh->hw_qtd_next == EHCI_LIST_END(ehci)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | switch (state) { |
| 426 | case QH_STATE_IDLE: |
| 427 | qh_refresh(ehci, qh); |
| 428 | break; |
| 429 | case QH_STATE_LINKED: |
| 430 | /* should be rare for periodic transfers, |
| 431 | * except maybe high bandwidth ... |
| 432 | */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 433 | if ((cpu_to_hc32(ehci, QH_SMASK) |
David Brownell | 7dedacf | 2005-08-04 18:06:41 -0700 | [diff] [blame] | 434 | & qh->hw_info2) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | intr_deschedule (ehci, qh); |
| 436 | (void) qh_schedule (ehci, qh); |
| 437 | } else |
| 438 | unlink_async (ehci, qh); |
| 439 | break; |
| 440 | /* otherwise, unlink already started */ |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | return count; |
| 445 | } |
| 446 | |
| 447 | /*-------------------------------------------------------------------------*/ |
| 448 | |
| 449 | // high bandwidth multiplier, as encoded in highspeed endpoint descriptors |
| 450 | #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03)) |
| 451 | // ... and packet size, for any kind of endpoint descriptor |
| 452 | #define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff) |
| 453 | |
| 454 | /* |
| 455 | * reverse of qh_urb_transaction: free a list of TDs. |
| 456 | * used for cleanup after errors, before HC sees an URB's TDs. |
| 457 | */ |
| 458 | static void qtd_list_free ( |
| 459 | struct ehci_hcd *ehci, |
| 460 | struct urb *urb, |
| 461 | struct list_head *qtd_list |
| 462 | ) { |
| 463 | struct list_head *entry, *temp; |
| 464 | |
| 465 | list_for_each_safe (entry, temp, qtd_list) { |
| 466 | struct ehci_qtd *qtd; |
| 467 | |
| 468 | qtd = list_entry (entry, struct ehci_qtd, qtd_list); |
| 469 | list_del (&qtd->qtd_list); |
| 470 | ehci_qtd_free (ehci, qtd); |
| 471 | } |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * create a list of filled qtds for this URB; won't link into qh. |
| 476 | */ |
| 477 | static struct list_head * |
| 478 | qh_urb_transaction ( |
| 479 | struct ehci_hcd *ehci, |
| 480 | struct urb *urb, |
| 481 | struct list_head *head, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 482 | gfp_t flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | ) { |
| 484 | struct ehci_qtd *qtd, *qtd_prev; |
| 485 | dma_addr_t buf; |
| 486 | int len, maxpacket; |
| 487 | int is_input; |
| 488 | u32 token; |
| 489 | |
| 490 | /* |
| 491 | * URBs map to sequences of QTDs: one logical transaction |
| 492 | */ |
| 493 | qtd = ehci_qtd_alloc (ehci, flags); |
| 494 | if (unlikely (!qtd)) |
| 495 | return NULL; |
| 496 | list_add_tail (&qtd->qtd_list, head); |
| 497 | qtd->urb = urb; |
| 498 | |
| 499 | token = QTD_STS_ACTIVE; |
| 500 | token |= (EHCI_TUNE_CERR << 10); |
| 501 | /* for split transactions, SplitXState initialized to zero */ |
| 502 | |
| 503 | len = urb->transfer_buffer_length; |
| 504 | is_input = usb_pipein (urb->pipe); |
| 505 | if (usb_pipecontrol (urb->pipe)) { |
| 506 | /* SETUP pid */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 507 | qtd_fill(ehci, qtd, urb->setup_dma, |
| 508 | sizeof (struct usb_ctrlrequest), |
| 509 | token | (2 /* "setup" */ << 8), 8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
| 511 | /* ... and always at least one more pid */ |
| 512 | token ^= QTD_TOGGLE; |
| 513 | qtd_prev = qtd; |
| 514 | qtd = ehci_qtd_alloc (ehci, flags); |
| 515 | if (unlikely (!qtd)) |
| 516 | goto cleanup; |
| 517 | qtd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 518 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | list_add_tail (&qtd->qtd_list, head); |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 520 | |
| 521 | /* for zero length DATA stages, STATUS is always IN */ |
| 522 | if (len == 0) |
| 523 | token |= (1 /* "in" */ << 8); |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 524 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
| 526 | /* |
| 527 | * data transfer stage: buffer setup |
| 528 | */ |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 529 | buf = urb->transfer_dma; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 531 | if (is_input) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | token |= (1 /* "in" */ << 8); |
| 533 | /* else it's already initted to "out" pid (0 << 8) */ |
| 534 | |
| 535 | maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input)); |
| 536 | |
| 537 | /* |
| 538 | * buffer gets wrapped in one or more qtds; |
| 539 | * last one may be "short" (including zero len) |
| 540 | * and may serve as a control status ack |
| 541 | */ |
| 542 | for (;;) { |
| 543 | int this_qtd_len; |
| 544 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 545 | this_qtd_len = qtd_fill(ehci, qtd, buf, len, token, maxpacket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | len -= this_qtd_len; |
| 547 | buf += this_qtd_len; |
| 548 | if (is_input) |
| 549 | qtd->hw_alt_next = ehci->async->hw_alt_next; |
| 550 | |
| 551 | /* qh makes control packets use qtd toggle; maybe switch it */ |
| 552 | if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0) |
| 553 | token ^= QTD_TOGGLE; |
| 554 | |
| 555 | if (likely (len <= 0)) |
| 556 | break; |
| 557 | |
| 558 | qtd_prev = qtd; |
| 559 | qtd = ehci_qtd_alloc (ehci, flags); |
| 560 | if (unlikely (!qtd)) |
| 561 | goto cleanup; |
| 562 | qtd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 563 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | list_add_tail (&qtd->qtd_list, head); |
| 565 | } |
| 566 | |
| 567 | /* unless the bulk/interrupt caller wants a chance to clean |
| 568 | * up after short reads, hc should advance qh past this urb |
| 569 | */ |
| 570 | if (likely ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0 |
| 571 | || usb_pipecontrol (urb->pipe))) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 572 | qtd->hw_alt_next = EHCI_LIST_END(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
| 574 | /* |
| 575 | * control requests may need a terminating data "status" ack; |
| 576 | * bulk ones may need a terminating short packet (zero length). |
| 577 | */ |
Alan Stern | 6912354 | 2005-11-03 11:44:49 -0500 | [diff] [blame] | 578 | if (likely (urb->transfer_buffer_length != 0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | int one_more = 0; |
| 580 | |
| 581 | if (usb_pipecontrol (urb->pipe)) { |
| 582 | one_more = 1; |
| 583 | token ^= 0x0100; /* "in" <--> "out" */ |
| 584 | token |= QTD_TOGGLE; /* force DATA1 */ |
| 585 | } else if (usb_pipebulk (urb->pipe) |
| 586 | && (urb->transfer_flags & URB_ZERO_PACKET) |
| 587 | && !(urb->transfer_buffer_length % maxpacket)) { |
| 588 | one_more = 1; |
| 589 | } |
| 590 | if (one_more) { |
| 591 | qtd_prev = qtd; |
| 592 | qtd = ehci_qtd_alloc (ehci, flags); |
| 593 | if (unlikely (!qtd)) |
| 594 | goto cleanup; |
| 595 | qtd->urb = urb; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 596 | qtd_prev->hw_next = QTD_NEXT(ehci, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | list_add_tail (&qtd->qtd_list, head); |
| 598 | |
| 599 | /* never any data in such packets */ |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 600 | qtd_fill(ehci, qtd, 0, 0, token, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | } |
| 602 | } |
| 603 | |
| 604 | /* by default, enable interrupt on urb completion */ |
| 605 | if (likely (!(urb->transfer_flags & URB_NO_INTERRUPT))) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 606 | qtd->hw_token |= cpu_to_hc32(ehci, QTD_IOC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | return head; |
| 608 | |
| 609 | cleanup: |
| 610 | qtd_list_free (ehci, urb, head); |
| 611 | return NULL; |
| 612 | } |
| 613 | |
| 614 | /*-------------------------------------------------------------------------*/ |
| 615 | |
| 616 | // Would be best to create all qh's from config descriptors, |
| 617 | // when each interface/altsetting is established. Unlink |
| 618 | // any previous qh and cancel its urbs first; endpoints are |
| 619 | // implicitly reset then (data toggle too). |
| 620 | // That'd mean updating how usbcore talks to HCDs. (2.7?) |
| 621 | |
| 622 | |
| 623 | /* |
| 624 | * Each QH holds a qtd list; a QH is used for everything except iso. |
| 625 | * |
| 626 | * For interrupt urbs, the scheduler must set the microframe scheduling |
| 627 | * mask(s) each time the QH gets scheduled. For highspeed, that's |
| 628 | * just one microframe in the s-mask. For split interrupt transactions |
| 629 | * there are additional complications: c-mask, maybe FSTNs. |
| 630 | */ |
| 631 | static struct ehci_qh * |
| 632 | qh_make ( |
| 633 | struct ehci_hcd *ehci, |
| 634 | struct urb *urb, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 635 | gfp_t flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | ) { |
| 637 | struct ehci_qh *qh = ehci_qh_alloc (ehci, flags); |
| 638 | u32 info1 = 0, info2 = 0; |
| 639 | int is_input, type; |
| 640 | int maxp = 0; |
| 641 | |
| 642 | if (!qh) |
| 643 | return qh; |
| 644 | |
| 645 | /* |
| 646 | * init endpoint/device data for this QH |
| 647 | */ |
| 648 | info1 |= usb_pipeendpoint (urb->pipe) << 8; |
| 649 | info1 |= usb_pipedevice (urb->pipe) << 0; |
| 650 | |
| 651 | is_input = usb_pipein (urb->pipe); |
| 652 | type = usb_pipetype (urb->pipe); |
| 653 | maxp = usb_maxpacket (urb->dev, urb->pipe, !is_input); |
| 654 | |
| 655 | /* Compute interrupt scheduling parameters just once, and save. |
| 656 | * - allowing for high bandwidth, how many nsec/uframe are used? |
| 657 | * - split transactions need a second CSPLIT uframe; same question |
| 658 | * - splits also need a schedule gap (for full/low speed I/O) |
| 659 | * - qh has a polling interval |
| 660 | * |
| 661 | * For control/bulk requests, the HC or TT handles these. |
| 662 | */ |
| 663 | if (type == PIPE_INTERRUPT) { |
Dan Streetman | 498f78e | 2005-07-29 12:18:28 -0700 | [diff] [blame] | 664 | qh->usecs = NS_TO_US (usb_calc_bus_time (USB_SPEED_HIGH, is_input, 0, |
| 665 | hb_mult (maxp) * max_packet (maxp))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | qh->start = NO_FRAME; |
| 667 | |
| 668 | if (urb->dev->speed == USB_SPEED_HIGH) { |
| 669 | qh->c_usecs = 0; |
| 670 | qh->gap_uf = 0; |
| 671 | |
| 672 | qh->period = urb->interval >> 3; |
| 673 | if (qh->period == 0 && urb->interval != 1) { |
| 674 | /* NOTE interval 2 or 4 uframes could work. |
| 675 | * But interval 1 scheduling is simpler, and |
| 676 | * includes high bandwidth. |
| 677 | */ |
| 678 | dbg ("intr period %d uframes, NYET!", |
| 679 | urb->interval); |
| 680 | goto done; |
| 681 | } |
| 682 | } else { |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 683 | struct usb_tt *tt = urb->dev->tt; |
| 684 | int think_time; |
| 685 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | /* gap is f(FS/LS transfer times) */ |
| 687 | qh->gap_uf = 1 + usb_calc_bus_time (urb->dev->speed, |
| 688 | is_input, 0, maxp) / (125 * 1000); |
| 689 | |
| 690 | /* FIXME this just approximates SPLIT/CSPLIT times */ |
| 691 | if (is_input) { // SPLIT, gap, CSPLIT+DATA |
| 692 | qh->c_usecs = qh->usecs + HS_USECS (0); |
| 693 | qh->usecs = HS_USECS (1); |
| 694 | } else { // SPLIT+DATA, gap, CSPLIT |
| 695 | qh->usecs += HS_USECS (1); |
| 696 | qh->c_usecs = HS_USECS (0); |
| 697 | } |
| 698 | |
david-b@pacbell.net | d038420 | 2005-08-13 18:44:58 -0700 | [diff] [blame] | 699 | think_time = tt ? tt->think_time : 0; |
| 700 | qh->tt_usecs = NS_TO_US (think_time + |
| 701 | usb_calc_bus_time (urb->dev->speed, |
| 702 | is_input, 0, max_packet (maxp))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | qh->period = urb->interval; |
| 704 | } |
| 705 | } |
| 706 | |
| 707 | /* support for tt scheduling, and access to toggles */ |
Alan Stern | 6a8e87b | 2006-01-19 10:46:27 -0500 | [diff] [blame] | 708 | qh->dev = urb->dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | |
| 710 | /* using TT? */ |
| 711 | switch (urb->dev->speed) { |
| 712 | case USB_SPEED_LOW: |
| 713 | info1 |= (1 << 12); /* EPS "low" */ |
| 714 | /* FALL THROUGH */ |
| 715 | |
| 716 | case USB_SPEED_FULL: |
| 717 | /* EPS 0 means "full" */ |
| 718 | if (type != PIPE_INTERRUPT) |
| 719 | info1 |= (EHCI_TUNE_RL_TT << 28); |
| 720 | if (type == PIPE_CONTROL) { |
| 721 | info1 |= (1 << 27); /* for TT */ |
| 722 | info1 |= 1 << 14; /* toggle from qtd */ |
| 723 | } |
| 724 | info1 |= maxp << 16; |
| 725 | |
| 726 | info2 |= (EHCI_TUNE_MULT_TT << 30); |
Kumar Gala | 8cd42e9 | 2006-01-20 13:57:52 -0800 | [diff] [blame] | 727 | |
| 728 | /* Some Freescale processors have an erratum in which the |
| 729 | * port number in the queue head was 0..N-1 instead of 1..N. |
| 730 | */ |
| 731 | if (ehci_has_fsl_portno_bug(ehci)) |
| 732 | info2 |= (urb->dev->ttport-1) << 23; |
| 733 | else |
| 734 | info2 |= urb->dev->ttport << 23; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
| 736 | /* set the address of the TT; for TDI's integrated |
| 737 | * root hub tt, leave it zeroed. |
| 738 | */ |
| 739 | if (!ehci_is_TDI(ehci) |
| 740 | || urb->dev->tt->hub != |
| 741 | ehci_to_hcd(ehci)->self.root_hub) |
| 742 | info2 |= urb->dev->tt->hub->devnum << 16; |
| 743 | |
| 744 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */ |
| 745 | |
| 746 | break; |
| 747 | |
| 748 | case USB_SPEED_HIGH: /* no TT involved */ |
| 749 | info1 |= (2 << 12); /* EPS "high" */ |
| 750 | if (type == PIPE_CONTROL) { |
| 751 | info1 |= (EHCI_TUNE_RL_HS << 28); |
| 752 | info1 |= 64 << 16; /* usb2 fixed maxpacket */ |
| 753 | info1 |= 1 << 14; /* toggle from qtd */ |
| 754 | info2 |= (EHCI_TUNE_MULT_HS << 30); |
| 755 | } else if (type == PIPE_BULK) { |
| 756 | info1 |= (EHCI_TUNE_RL_HS << 28); |
| 757 | info1 |= 512 << 16; /* usb2 fixed maxpacket */ |
| 758 | info2 |= (EHCI_TUNE_MULT_HS << 30); |
| 759 | } else { /* PIPE_INTERRUPT */ |
| 760 | info1 |= max_packet (maxp) << 16; |
| 761 | info2 |= hb_mult (maxp) << 30; |
| 762 | } |
| 763 | break; |
| 764 | default: |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 765 | dbg ("bogus dev %p speed %d", urb->dev, urb->dev->speed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | done: |
| 767 | qh_put (qh); |
| 768 | return NULL; |
| 769 | } |
| 770 | |
| 771 | /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */ |
| 772 | |
| 773 | /* init as live, toggle clear, advance to dummy */ |
| 774 | qh->qh_state = QH_STATE_IDLE; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 775 | qh->hw_info1 = cpu_to_hc32(ehci, info1); |
| 776 | qh->hw_info2 = cpu_to_hc32(ehci, info2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1); |
| 778 | qh_refresh (ehci, qh); |
| 779 | return qh; |
| 780 | } |
| 781 | |
| 782 | /*-------------------------------------------------------------------------*/ |
| 783 | |
| 784 | /* move qh (and its qtds) onto async queue; maybe enable queue. */ |
| 785 | |
| 786 | static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh) |
| 787 | { |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 788 | __hc32 dma = QH_NEXT(ehci, qh->qh_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | struct ehci_qh *head; |
| 790 | |
| 791 | /* (re)start the async schedule? */ |
| 792 | head = ehci->async; |
| 793 | timer_action_done (ehci, TIMER_ASYNC_OFF); |
| 794 | if (!head->qh_next.qh) { |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 795 | u32 cmd = ehci_readl(ehci, &ehci->regs->command); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
| 797 | if (!(cmd & CMD_ASE)) { |
| 798 | /* in case a clear of CMD_ASE didn't take yet */ |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 799 | (void)handshake(ehci, &ehci->regs->status, |
| 800 | STS_ASS, 0, 150); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | cmd |= CMD_ASE | CMD_RUN; |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 802 | ehci_writel(ehci, cmd, &ehci->regs->command); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | ehci_to_hcd(ehci)->state = HC_STATE_RUNNING; |
| 804 | /* posted write need not be known to HC yet ... */ |
| 805 | } |
| 806 | } |
| 807 | |
| 808 | /* clear halt and/or toggle; and maybe recover from silicon quirk */ |
| 809 | if (qh->qh_state == QH_STATE_IDLE) |
| 810 | qh_refresh (ehci, qh); |
| 811 | |
| 812 | /* splice right after start */ |
| 813 | qh->qh_next = head->qh_next; |
| 814 | qh->hw_next = head->hw_next; |
| 815 | wmb (); |
| 816 | |
| 817 | head->qh_next.qh = qh; |
| 818 | head->hw_next = dma; |
| 819 | |
| 820 | qh->qh_state = QH_STATE_LINKED; |
| 821 | /* qtd completions reported later by interrupt */ |
| 822 | } |
| 823 | |
| 824 | /*-------------------------------------------------------------------------*/ |
| 825 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | /* |
| 827 | * For control/bulk/interrupt, return QH with these TDs appended. |
| 828 | * Allocates and initializes the QH if necessary. |
| 829 | * Returns null if it can't allocate a QH it needs to. |
| 830 | * If the QH has TDs (urbs) already, that's great. |
| 831 | */ |
| 832 | static struct ehci_qh *qh_append_tds ( |
| 833 | struct ehci_hcd *ehci, |
| 834 | struct urb *urb, |
| 835 | struct list_head *qtd_list, |
| 836 | int epnum, |
| 837 | void **ptr |
| 838 | ) |
| 839 | { |
| 840 | struct ehci_qh *qh = NULL; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 841 | u32 qh_addr_mask = cpu_to_hc32(ehci, 0x7f); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
| 843 | qh = (struct ehci_qh *) *ptr; |
| 844 | if (unlikely (qh == NULL)) { |
| 845 | /* can't sleep here, we have ehci->lock... */ |
| 846 | qh = qh_make (ehci, urb, GFP_ATOMIC); |
| 847 | *ptr = qh; |
| 848 | } |
| 849 | if (likely (qh != NULL)) { |
| 850 | struct ehci_qtd *qtd; |
| 851 | |
| 852 | if (unlikely (list_empty (qtd_list))) |
| 853 | qtd = NULL; |
| 854 | else |
| 855 | qtd = list_entry (qtd_list->next, struct ehci_qtd, |
| 856 | qtd_list); |
| 857 | |
| 858 | /* control qh may need patching ... */ |
| 859 | if (unlikely (epnum == 0)) { |
| 860 | |
| 861 | /* usb_reset_device() briefly reverts to address 0 */ |
| 862 | if (usb_pipedevice (urb->pipe) == 0) |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 863 | qh->hw_info1 &= ~qh_addr_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | } |
| 865 | |
| 866 | /* just one way to queue requests: swap with the dummy qtd. |
| 867 | * only hc or qh_refresh() ever modify the overlay. |
| 868 | */ |
| 869 | if (likely (qtd != NULL)) { |
| 870 | struct ehci_qtd *dummy; |
| 871 | dma_addr_t dma; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 872 | __hc32 token; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
| 874 | /* to avoid racing the HC, use the dummy td instead of |
| 875 | * the first td of our list (becomes new dummy). both |
| 876 | * tds stay deactivated until we're done, when the |
| 877 | * HC is allowed to fetch the old dummy (4.10.2). |
| 878 | */ |
| 879 | token = qtd->hw_token; |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 880 | qtd->hw_token = HALT_BIT(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | wmb (); |
| 882 | dummy = qh->dummy; |
| 883 | |
| 884 | dma = dummy->qtd_dma; |
| 885 | *dummy = *qtd; |
| 886 | dummy->qtd_dma = dma; |
| 887 | |
| 888 | list_del (&qtd->qtd_list); |
| 889 | list_add (&dummy->qtd_list, qtd_list); |
| 890 | __list_splice (qtd_list, qh->qtd_list.prev); |
| 891 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 892 | ehci_qtd_init(ehci, qtd, qtd->qtd_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | qh->dummy = qtd; |
| 894 | |
| 895 | /* hc must see the new dummy at list end */ |
| 896 | dma = qtd->qtd_dma; |
| 897 | qtd = list_entry (qh->qtd_list.prev, |
| 898 | struct ehci_qtd, qtd_list); |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 899 | qtd->hw_next = QTD_NEXT(ehci, dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
| 901 | /* let the hc process these next qtds */ |
| 902 | wmb (); |
| 903 | dummy->hw_token = token; |
| 904 | |
| 905 | urb->hcpriv = qh_get (qh); |
| 906 | } |
| 907 | } |
| 908 | return qh; |
| 909 | } |
| 910 | |
| 911 | /*-------------------------------------------------------------------------*/ |
| 912 | |
| 913 | static int |
| 914 | submit_async ( |
| 915 | struct ehci_hcd *ehci, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | struct urb *urb, |
| 917 | struct list_head *qtd_list, |
Al Viro | 55016f1 | 2005-10-21 03:21:58 -0400 | [diff] [blame] | 918 | gfp_t mem_flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | ) { |
| 920 | struct ehci_qtd *qtd; |
| 921 | int epnum; |
| 922 | unsigned long flags; |
| 923 | struct ehci_qh *qh = NULL; |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 924 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
| 926 | qtd = list_entry (qtd_list->next, struct ehci_qtd, qtd_list); |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 927 | epnum = urb->ep->desc.bEndpointAddress; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | |
| 929 | #ifdef EHCI_URB_TRACE |
| 930 | ehci_dbg (ehci, |
| 931 | "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n", |
| 932 | __FUNCTION__, urb->dev->devpath, urb, |
| 933 | epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out", |
| 934 | urb->transfer_buffer_length, |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 935 | qtd, urb->ep->hcpriv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | #endif |
| 937 | |
| 938 | spin_lock_irqsave (&ehci->lock, flags); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 939 | if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, |
| 940 | &ehci_to_hcd(ehci)->flags))) { |
| 941 | rc = -ESHUTDOWN; |
| 942 | goto done; |
| 943 | } |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 944 | rc = usb_hcd_link_urb_to_ep(ehci_to_hcd(ehci), urb); |
| 945 | if (unlikely(rc)) |
| 946 | goto done; |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 947 | |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 948 | qh = qh_append_tds(ehci, urb, qtd_list, epnum, &urb->ep->hcpriv); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 949 | if (unlikely(qh == NULL)) { |
Alan Stern | e9df41c | 2007-08-08 11:48:02 -0400 | [diff] [blame] | 950 | usb_hcd_unlink_urb_from_ep(ehci_to_hcd(ehci), urb); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 951 | rc = -ENOMEM; |
| 952 | goto done; |
| 953 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | |
| 955 | /* Control/bulk operations through TTs don't need scheduling, |
| 956 | * the HC and TT handle it when the TT has a buffer ready. |
| 957 | */ |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 958 | if (likely (qh->qh_state == QH_STATE_IDLE)) |
| 959 | qh_link_async (ehci, qh_get (qh)); |
| 960 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | spin_unlock_irqrestore (&ehci->lock, flags); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 962 | if (unlikely (qh == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | qtd_list_free (ehci, urb, qtd_list); |
Benjamin Herrenschmidt | 8de9840 | 2005-11-25 09:59:46 +1100 | [diff] [blame] | 964 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | } |
| 966 | |
| 967 | /*-------------------------------------------------------------------------*/ |
| 968 | |
| 969 | /* the async qh for the qtds being reclaimed are now unlinked from the HC */ |
| 970 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 971 | static void end_unlink_async (struct ehci_hcd *ehci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | { |
| 973 | struct ehci_qh *qh = ehci->reclaim; |
| 974 | struct ehci_qh *next; |
| 975 | |
Alan Stern | 07d29b6 | 2007-12-11 16:05:30 -0500 | [diff] [blame^] | 976 | iaa_watchdog_done(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
Stefan Roese | 6dbd682 | 2007-05-01 09:29:37 -0700 | [diff] [blame] | 978 | // qh->hw_next = cpu_to_hc32(qh->qh_dma); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | qh->qh_state = QH_STATE_IDLE; |
| 980 | qh->qh_next.qh = NULL; |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 981 | qh_put (qh); // refcount from reclaim |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | |
| 983 | /* other unlink(s) may be pending (in QH_STATE_UNLINK_WAIT) */ |
| 984 | next = qh->reclaim; |
| 985 | ehci->reclaim = next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | qh->reclaim = NULL; |
| 987 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 988 | qh_completions (ehci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | |
| 990 | if (!list_empty (&qh->qtd_list) |
| 991 | && HC_IS_RUNNING (ehci_to_hcd(ehci)->state)) |
| 992 | qh_link_async (ehci, qh); |
| 993 | else { |
| 994 | qh_put (qh); // refcount from async list |
| 995 | |
| 996 | /* it's not free to turn the async schedule on/off; leave it |
| 997 | * active but idle for a while once it empties. |
| 998 | */ |
| 999 | if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) |
| 1000 | && ehci->async->qh_next.qh == NULL) |
| 1001 | timer_action (ehci, TIMER_ASYNC_OFF); |
| 1002 | } |
| 1003 | |
| 1004 | if (next) { |
| 1005 | ehci->reclaim = NULL; |
| 1006 | start_unlink_async (ehci, next); |
| 1007 | } |
| 1008 | } |
| 1009 | |
| 1010 | /* makes sure the async qh will become idle */ |
| 1011 | /* caller must own ehci->lock */ |
| 1012 | |
| 1013 | static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh) |
| 1014 | { |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 1015 | int cmd = ehci_readl(ehci, &ehci->regs->command); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | struct ehci_qh *prev; |
| 1017 | |
| 1018 | #ifdef DEBUG |
| 1019 | assert_spin_locked(&ehci->lock); |
| 1020 | if (ehci->reclaim |
| 1021 | || (qh->qh_state != QH_STATE_LINKED |
| 1022 | && qh->qh_state != QH_STATE_UNLINK_WAIT) |
| 1023 | ) |
| 1024 | BUG (); |
| 1025 | #endif |
| 1026 | |
| 1027 | /* stop async schedule right now? */ |
| 1028 | if (unlikely (qh == ehci->async)) { |
| 1029 | /* can't get here without STS_ASS set */ |
David Brownell | d085229 | 2006-01-20 14:35:55 -0800 | [diff] [blame] | 1030 | if (ehci_to_hcd(ehci)->state != HC_STATE_HALT |
| 1031 | && !ehci->reclaim) { |
| 1032 | /* ... and CMD_IAAD clear */ |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 1033 | ehci_writel(ehci, cmd & ~CMD_ASE, |
| 1034 | &ehci->regs->command); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | wmb (); |
| 1036 | // handshake later, if we need to |
David Brownell | d085229 | 2006-01-20 14:35:55 -0800 | [diff] [blame] | 1037 | timer_action_done (ehci, TIMER_ASYNC_OFF); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | return; |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 1040 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | |
| 1042 | qh->qh_state = QH_STATE_UNLINK; |
| 1043 | ehci->reclaim = qh = qh_get (qh); |
| 1044 | |
| 1045 | prev = ehci->async; |
| 1046 | while (prev->qh_next.qh != qh) |
| 1047 | prev = prev->qh_next.qh; |
| 1048 | |
| 1049 | prev->hw_next = qh->hw_next; |
| 1050 | prev->qh_next = qh->qh_next; |
| 1051 | wmb (); |
| 1052 | |
| 1053 | if (unlikely (ehci_to_hcd(ehci)->state == HC_STATE_HALT)) { |
| 1054 | /* if (unlikely (qh->reclaim != 0)) |
David Brownell | 53bd6a6 | 2006-08-30 14:50:06 -0700 | [diff] [blame] | 1055 | * this will recurse, probably not much |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1057 | end_unlink_async (ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | return; |
| 1059 | } |
| 1060 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | cmd |= CMD_IAAD; |
Benjamin Herrenschmidt | 083522d | 2006-12-15 06:54:08 +1100 | [diff] [blame] | 1062 | ehci_writel(ehci, cmd, &ehci->regs->command); |
| 1063 | (void)ehci_readl(ehci, &ehci->regs->command); |
Alan Stern | 07d29b6 | 2007-12-11 16:05:30 -0500 | [diff] [blame^] | 1064 | iaa_watchdog_start(ehci); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | } |
| 1066 | |
| 1067 | /*-------------------------------------------------------------------------*/ |
| 1068 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1069 | static void scan_async (struct ehci_hcd *ehci) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | { |
| 1071 | struct ehci_qh *qh; |
| 1072 | enum ehci_timer_action action = TIMER_IO_WATCHDOG; |
| 1073 | |
| 1074 | if (!++(ehci->stamp)) |
| 1075 | ehci->stamp++; |
| 1076 | timer_action_done (ehci, TIMER_ASYNC_SHRINK); |
| 1077 | rescan: |
| 1078 | qh = ehci->async->qh_next.qh; |
| 1079 | if (likely (qh != NULL)) { |
| 1080 | do { |
| 1081 | /* clean any finished work for this qh */ |
| 1082 | if (!list_empty (&qh->qtd_list) |
| 1083 | && qh->stamp != ehci->stamp) { |
| 1084 | int temp; |
| 1085 | |
| 1086 | /* unlinks could happen here; completion |
| 1087 | * reporting drops the lock. rescan using |
| 1088 | * the latest schedule, but don't rescan |
| 1089 | * qhs we already finished (no looping). |
| 1090 | */ |
| 1091 | qh = qh_get (qh); |
| 1092 | qh->stamp = ehci->stamp; |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 1093 | temp = qh_completions (ehci, qh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | qh_put (qh); |
| 1095 | if (temp != 0) { |
| 1096 | goto rescan; |
| 1097 | } |
| 1098 | } |
| 1099 | |
| 1100 | /* unlink idle entries, reducing HC PCI usage as well |
| 1101 | * as HCD schedule-scanning costs. delay for any qh |
| 1102 | * we just scanned, there's a not-unusual case that it |
| 1103 | * doesn't stay idle for long. |
| 1104 | * (plus, avoids some kind of re-activation race.) |
| 1105 | */ |
| 1106 | if (list_empty (&qh->qtd_list)) { |
| 1107 | if (qh->stamp == ehci->stamp) |
| 1108 | action = TIMER_ASYNC_SHRINK; |
| 1109 | else if (!ehci->reclaim |
| 1110 | && qh->qh_state == QH_STATE_LINKED) |
| 1111 | start_unlink_async (ehci, qh); |
| 1112 | } |
| 1113 | |
| 1114 | qh = qh->qh_next.qh; |
| 1115 | } while (qh); |
| 1116 | } |
| 1117 | if (action == TIMER_ASYNC_SHRINK) |
| 1118 | timer_action (ehci, TIMER_ASYNC_SHRINK); |
| 1119 | } |