ehci-q.c revision 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
11c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil/* 21c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * Copyright (c) 2001-2002 by David Brownell 31c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * 41c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * This program is free software; you can redistribute it and/or modify it 56afdeaf865b729287e02aafc61d8d013b89996efAndy Walls * under the terms of the GNU General Public License as published by the 61c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * Free Software Foundation; either version 2 of the License, or (at your 71c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * option) any later version. 81c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * 91c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * This program is distributed in the hope that it will be useful, but 101c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 111c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 121c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * for more details. 131c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * 141c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * You should have received a copy of the GNU General Public License 151c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * along with this program; if not, write to the Free Software Foundation, 161c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 171c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil */ 181c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 191c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil/* this file is part of ehci-hcd.c */ 201c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 211c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil/*-------------------------------------------------------------------------*/ 221c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 231c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil/* 241c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * EHCI hardware queue manipulation ... the core. QH/QTD manipulation. 251c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * 26b1526421eac9a912b2cda7e147f1da2aa31be278Andy Walls * Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd" 271c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned 281c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * buffers needed for the larger number). We use one QH per endpoint, queue 291c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * multiple urbs (all three types) per endpoint. URBs may need several qtds. 30ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * 31ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * ISO traffic uses "ISO TD" (itd, and sitd) records, and (along with 329972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller * interrupts) needs careful scheduling. Performance improvements can be 33ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * an ongoing challenge. That's in "ehci-sched.c". 34ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * 351c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs, 361c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * or otherwise through transaction translators (TTs) in USB 2.0 hubs using 371c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * (b) special fields in qh entries or (c) split iso entries. TTs will 381c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * buffer low/full speed data so the host collects it at high speed. 391c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil */ 401c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 411c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil/*-------------------------------------------------------------------------*/ 421c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 431c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil/* fill a qtd, returning how much of the buffer we were able to queue up */ 441c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 451c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuilstatic int 461c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuilqtd_fill (struct ehci_qtd *qtd, dma_addr_t buf, size_t len, 471c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil int token, int maxpacket) 481c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil{ 491c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil int i, count; 501c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil u64 addr = buf; 511c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 521c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* one buffer entry per 4K ... first might be short or unaligned */ 531c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd->hw_buf [0] = cpu_to_le32 ((u32)addr); 541c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd->hw_buf_hi [0] = cpu_to_le32 ((u32)(addr >> 32)); 551c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil count = 0x1000 - (buf & 0x0fff); /* rest of that page */ 561c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (likely (len < count)) /* ... iff needed */ 571c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil count = len; 581c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil else { 591c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil buf += 0x1000; 601c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil buf &= ~0x0fff; 611c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 621c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* per-qtd limit: from 16K to 20K (best alignment) */ 631c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil for (i = 1; count < len && i < 5; i++) { 641c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil addr = buf; 651c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd->hw_buf [i] = cpu_to_le32 ((u32)addr); 661c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd->hw_buf_hi [i] = cpu_to_le32 ((u32)(addr >> 32)); 671c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil buf += 0x1000; 681c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if ((count + 0x1000) < len) 691c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil count += 0x1000; 701c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil else 711c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil count = len; 721c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil } 731c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 741c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* short packets may only terminate transfers */ 751c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (count != len) 761c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil count -= (count % maxpacket); 771c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil } 781c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd->hw_token = cpu_to_le32 ((count << 16) | token); 791c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd->length = count; 801c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 811c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil return count; 821c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil} 831c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 84b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth/*-------------------------------------------------------------------------*/ 851c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 861c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuilstatic inline void 874e6b61047db2a77a250b6510bdb3c20c41aee591Andy Wallsqh_update (struct ehci_hcd *ehci, struct ehci_qh *qh, struct ehci_qtd *qtd) 88350145a4f7d0edffdccdace1221efc6d1d362a36Andy Walls{ 89350145a4f7d0edffdccdace1221efc6d1d362a36Andy Walls /* writes to an active overlay are unsafe */ 90fd6b9c978dc3447b9b4677d8949ef3ea7f946abcAndy Walls BUG_ON(qh->qh_state != QH_STATE_IDLE); 91fd6b9c978dc3447b9b4677d8949ef3ea7f946abcAndy Walls 921c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh->hw_qtd_next = QTD_NEXT (qtd->qtd_dma); 931c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh->hw_alt_next = EHCI_LIST_END; 941c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 951c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* Except for control endpoints, we make hardware maintain data 961c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * toggle (like OHCI) ... here (re)initialize the toggle in the QH, 971c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * and set the pseudo-toggle in udev. Only usb_clear_halt() will 981c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * ever clear it. 991c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil */ 1001c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (!(qh->hw_info1 & cpu_to_le32(1 << 14))) { 1011c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil unsigned is_out, epnum; 1021c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 1031c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil is_out = !(qtd->hw_token & cpu_to_le32(1 << 8)); 1041c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil epnum = (le32_to_cpup(&qh->hw_info1) >> 8) & 0x0f; 10550299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls if (unlikely (!usb_gettoggle (qh->dev, epnum, is_out))) { 10650299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls qh->hw_token &= ~__constant_cpu_to_le32 (QTD_TOGGLE); 107ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls usb_settoggle (qh->dev, epnum, is_out, 1); 108ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 109ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 110ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 11150299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls /* HC must see latest qtd and qh data before we clear ACTIVE+HALT */ 11250299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls wmb (); 11350299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls qh->hw_token &= __constant_cpu_to_le32 (QTD_TOGGLE | QTD_STS_PING); 11450299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls} 11550299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls 11650299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls/* if it weren't for a common silicon quirk (writing the dummy into the qh 11750299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault 11850299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls * recovery (including urb dequeue) would need software changes to a QH... 11950299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls */ 12050299994181b835e5a6ee2882df2ee07e7fb4491Andy Wallsstatic void 12150299994181b835e5a6ee2882df2ee07e7fb4491Andy Wallsqh_refresh (struct ehci_hcd *ehci, struct ehci_qh *qh) 12250299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls{ 123ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls struct ehci_qtd *qtd; 124ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 125ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (list_empty (&qh->qtd_list)) 126ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd = qh->dummy; 12750299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls else { 12850299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls qtd = list_entry (qh->qtd_list.next, 129ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls struct ehci_qtd, qtd_list); 130ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* first qtd may already be partially processed */ 131ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (cpu_to_le32 (qtd->qtd_dma) == qh->hw_current) 132ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd = NULL; 133ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 134ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 135ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (qtd) 13652fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls qh_update (ehci, qh, qtd); 13752fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls} 13852fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls 13952fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls/*-------------------------------------------------------------------------*/ 140754f9969c323559a12bce1475f3c1e6574129856Andy Walls 14152fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Wallsstatic void qtd_copy_status ( 14252fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls struct ehci_hcd *ehci, 14352fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls struct urb *urb, 14452fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls size_t length, 14552fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls u32 token 14652fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls) 14752fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls{ 14852fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls /* count IN/OUT bytes, not SETUP (even short packets) */ 14952fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls if (likely (QTD_PID (token) != 2)) 150754f9969c323559a12bce1475f3c1e6574129856Andy Walls urb->actual_length += length - QTD_LENGTH (token); 15152fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls 15252fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls /* don't modify error codes */ 15352fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls if (unlikely (urb->status != -EINPROGRESS)) 15452fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls return; 15552fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls 15652fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls /* force cleanup after short read; not always an error */ 15752fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls if (unlikely (IS_SHORT_READ (token))) 158754f9969c323559a12bce1475f3c1e6574129856Andy Walls urb->status = -EREMOTEIO; 15952fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls 16052fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls /* serious "can't proceed" faults reported by the hardware */ 16152fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls if (token & QTD_STS_HALT) { 162b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth if (token & QTD_STS_BABBLE) { 163b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth /* FIXME "must" disable babbling device's port too */ 164b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth urb->status = -EOVERFLOW; 165b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth } else if (token & QTD_STS_MMF) { 166b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth /* fs/ls interrupt xfer missed the complete-split */ 167bea3c54f52ba84ddd8bfc9228255ff501e9b5c21Simon Farnsworth urb->status = -EPROTO; 168b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth } else if (token & QTD_STS_DBE) { 169b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth urb->status = (QTD_PID (token) == 1) /* IN ? */ 170b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth ? -ENOSR /* hc couldn't read data */ 171b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth : -ECOMM; /* hc couldn't write data */ 172b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth } else if (token & QTD_STS_XACT) { 173b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth /* timeout, bad crc, wrong PID, etc; retried */ 174b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth if (QTD_CERR (token)) 175b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth urb->status = -EPIPE; 176b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth else { 177b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth ehci_dbg (ehci, "devpath %s ep%d%s 3strikes\n", 178b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth urb->dev->devpath, 1791bf5842fe3b61d2dbbced96dbd27ad26fe93444aSimon Farnsworth usb_pipeendpoint (urb->pipe), 180b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth usb_pipein (urb->pipe) ? "in" : "out"); 181b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth urb->status = -EPROTO; 182b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth } 183b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth /* CERR nonzero + no errors + halt --> stall */ 184b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth } else if (QTD_CERR (token)) 185b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth urb->status = -EPIPE; 186b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth else /* unknown */ 187b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth urb->status = -EPROTO; 188b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth 189b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth ehci_vdbg (ehci, 190b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth "dev%d ep%d%s qtd token %08x --> status %d\n", 191b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth usb_pipedevice (urb->pipe), 192b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth usb_pipeendpoint (urb->pipe), 193b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth usb_pipein (urb->pipe) ? "in" : "out", 194b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth token, urb->status); 195b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth 196b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth /* if async CSPLIT failed, try cleaning out the TT buffer */ 197b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth if (urb->status != -EPIPE 198b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth && urb->dev->tt && !usb_pipeint (urb->pipe) 19909fc9802c31a9358a4e34642aa5f569111752879Simon Farnsworth && ((token & QTD_STS_MMF) != 0 200b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth || QTD_CERR(token) == 0) 201b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth && (!ehci_is_TDI(ehci) 202b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth || urb->dev->tt->hub != 203b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth ehci_to_hcd(ehci)->self.root_hub)) { 204b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth#ifdef DEBUG 205bea3c54f52ba84ddd8bfc9228255ff501e9b5c21Simon Farnsworth struct usb_device *tt = urb->dev->tt->hub; 206b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth dev_dbg (&tt->dev, 207b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth "clear tt buffer port %d, a%d ep%d t%08x\n", 208b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth urb->dev->ttport, urb->dev->devnum, 209b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth usb_pipeendpoint (urb->pipe), token); 210b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth#endif /* DEBUG */ 2111bf5842fe3b61d2dbbced96dbd27ad26fe93444aSimon Farnsworth usb_hub_tt_clear_buffer (urb->dev, urb->pipe); 212b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth } 213b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth } 214b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth} 215b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth 2169972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmuellerstatic void 2179972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmuellerehci_urb_done (struct ehci_hcd *ehci, struct urb *urb, struct pt_regs *regs) 2189972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller__releases(ehci->lock) 2199972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller__acquires(ehci->lock) 2209972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller{ 2219972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller if (likely (urb->hcpriv != NULL)) { 2229972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller struct ehci_qh *qh = (struct ehci_qh *) urb->hcpriv; 2239972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller 2249972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller /* S-mask in a QH means it's an interrupt urb */ 2259972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller if ((qh->hw_info2 & __constant_cpu_to_le32 (0x00ff)) != 0) { 2269972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller 2279972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller /* ... update hc-wide periodic stats (for usbfs) */ 2289972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller ehci_to_hcd(ehci)->self.bandwidth_int_reqs--; 2299972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller } 2309972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller qh_put (qh); 2319972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller } 2329972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller 2339972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller spin_lock (&urb->lock); 2349972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller urb->hcpriv = NULL; 2359972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller switch (urb->status) { 2369972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller case -EINPROGRESS: /* success */ 2379972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller urb->status = 0; 2389972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller default: /* fault */ 2399972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller COUNT (ehci->stats.complete); 2409972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller break; 2419972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller case -EREMOTEIO: /* fault or normal */ 2429972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller if (!(urb->transfer_flags & URB_SHORT_NOT_OK)) 2439972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller urb->status = 0; 244deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls COUNT (ehci->stats.complete); 245ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls break; 246bca11a5721917d6d5874571813673a2669ffec4bAndy Walls case -ECONNRESET: /* canceled */ 247ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls case -ENOENT: 248ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls COUNT (ehci->stats.unlink); 249ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls break; 25052fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls } 251ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls spin_unlock (&urb->lock); 252ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 253ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls#ifdef EHCI_URB_TRACE 254ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls ehci_dbg (ehci, 255ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls "%s %s urb %p ep%d%s status %d len %d/%d\n", 256ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls __FUNCTION__, urb->dev->devpath, urb, 257ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls usb_pipeendpoint (urb->pipe), 258ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls usb_pipein (urb->pipe) ? "in" : "out", 259bca11a5721917d6d5874571813673a2669ffec4bAndy Walls urb->status, 260bca11a5721917d6d5874571813673a2669ffec4bAndy Walls urb->actual_length, urb->transfer_buffer_length); 261bca11a5721917d6d5874571813673a2669ffec4bAndy Walls#endif 262ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 263ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* complete() can reenter this HCD */ 264ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls spin_unlock (&ehci->lock); 265ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls usb_hcd_giveback_urb (ehci_to_hcd(ehci), urb, regs); 266ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls spin_lock (&ehci->lock); 267ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls} 268bca11a5721917d6d5874571813673a2669ffec4bAndy Walls 269bca11a5721917d6d5874571813673a2669ffec4bAndy Wallsstatic void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh); 270bca11a5721917d6d5874571813673a2669ffec4bAndy Wallsstatic void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh); 27152fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls 272bca11a5721917d6d5874571813673a2669ffec4bAndy Wallsstatic void intr_deschedule (struct ehci_hcd *ehci, struct ehci_qh *qh); 273bca11a5721917d6d5874571813673a2669ffec4bAndy Wallsstatic int qh_schedule (struct ehci_hcd *ehci, struct ehci_qh *qh); 274bca11a5721917d6d5874571813673a2669ffec4bAndy Walls 275bca11a5721917d6d5874571813673a2669ffec4bAndy Walls/* 276bca11a5721917d6d5874571813673a2669ffec4bAndy Walls * Process and free completed qtds for a qh, returning URBs to drivers. 277bca11a5721917d6d5874571813673a2669ffec4bAndy Walls * Chases up to qh->hw_current. Returns number of completions called, 278bca11a5721917d6d5874571813673a2669ffec4bAndy Walls * indicating how much "real" work we did. 279bca11a5721917d6d5874571813673a2669ffec4bAndy Walls */ 280bca11a5721917d6d5874571813673a2669ffec4bAndy Walls#define HALT_BIT __constant_cpu_to_le32(QTD_STS_HALT) 281bca11a5721917d6d5874571813673a2669ffec4bAndy Wallsstatic unsigned 28252fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Wallsqh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh, struct pt_regs *regs) 283bca11a5721917d6d5874571813673a2669ffec4bAndy Walls{ 284bca11a5721917d6d5874571813673a2669ffec4bAndy Walls struct ehci_qtd *last = NULL, *end = qh->dummy; 285bca11a5721917d6d5874571813673a2669ffec4bAndy Walls struct list_head *entry, *tmp; 286bca11a5721917d6d5874571813673a2669ffec4bAndy Walls int stopped; 28752fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls unsigned count = 0; 288abb096de82f6f920a06ca935f76925261e66b556Andy Walls int do_status = 0; 289bca11a5721917d6d5874571813673a2669ffec4bAndy Walls u8 state; 290bca11a5721917d6d5874571813673a2669ffec4bAndy Walls 291fa655dda5ce6e5ac4a9b94fd451358edca2ddab8Andy Walls if (unlikely (list_empty (&qh->qtd_list))) 292fa655dda5ce6e5ac4a9b94fd451358edca2ddab8Andy Walls return count; 293bca11a5721917d6d5874571813673a2669ffec4bAndy Walls 29452fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls /* completions (or tasks on other cpus) must never clobber HALT 295bca11a5721917d6d5874571813673a2669ffec4bAndy Walls * till we've gone through and cleaned everything up, even when 296bca11a5721917d6d5874571813673a2669ffec4bAndy Walls * they add urbs to this qh's queue or mark them for unlinking. 297bca11a5721917d6d5874571813673a2669ffec4bAndy Walls * 29852fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls * NOTE: unlinking expects to be done in queue order. 299abb096de82f6f920a06ca935f76925261e66b556Andy Walls */ 30052fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls state = qh->qh_state; 30152fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls qh->qh_state = QH_STATE_COMPLETING; 30252fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls stopped = (state == QH_STATE_IDLE); 303bca11a5721917d6d5874571813673a2669ffec4bAndy Walls 304ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* remove de-activated QTDs from front of queue. 305ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * after faults (including short reads), cleanup this urb 306ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * then let the queue advance. 30740c5520f55924ba87090d0d93222baad74202559Andy Walls * if queue is stopped, handles unlinks. 30852fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls */ 30940c5520f55924ba87090d0d93222baad74202559Andy Walls list_for_each_safe (entry, tmp, &qh->qtd_list) { 3109972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller struct ehci_qtd *qtd; 3119972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller struct urb *urb; 3129972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller u32 token = 0; 3139972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller 3149972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller qtd = list_entry (entry, struct ehci_qtd, qtd_list); 3159972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller urb = qtd->urb; 3169972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller 3179972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller /* clean up any state from previous QTD ...*/ 3189972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller if (last) { 3199972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller if (likely (last->urb != urb)) { 3209972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller ehci_urb_done (ehci, last->urb, regs); 321b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth count++; 322b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth } 323b7101de3fff596b35e45cd9fb7007caa07e97c9aSteven Toth ehci_qtd_free (ehci, last); 3249972de904216828c9f9f9d638df52206aa2bacd1Devin Heitmueller last = NULL; 32552fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls } 326ef99179710d6ec04d6783afdf8387523c7087920Andy Walls 327ef99179710d6ec04d6783afdf8387523c7087920Andy Walls /* ignore urbs submitted during completions we reported */ 328ef99179710d6ec04d6783afdf8387523c7087920Andy Walls if (qtd == end) 329ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls break; 33052fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls 33140c5520f55924ba87090d0d93222baad74202559Andy Walls /* hardware copies qtd out of qh overlay */ 33240c5520f55924ba87090d0d93222baad74202559Andy Walls rmb (); 333ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls token = le32_to_cpu (qtd->hw_token); 334ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 335ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* always clean up qtds the hc de-activated */ 336ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if ((token & QTD_STS_ACTIVE) == 0) { 337ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 338deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls if ((token & QTD_STS_HALT) != 0) { 339ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls stopped = 1; 340ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 341ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* magic dummy for some short reads; qh won't advance. 342ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * that silicon quirk can kick in with this dummy too. 343ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls */ 344ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } else if (IS_SHORT_READ (token) 345ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls && !(qtd->hw_alt_next & EHCI_LIST_END)) { 346ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls stopped = 1; 347ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls goto halt; 348ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 349deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls 350ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* stop scanning when we reach qtds the hc is using */ 351ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } else if (likely (!stopped 352ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls && HC_IS_RUNNING (ehci_to_hcd(ehci)->state))) { 353ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls break; 354ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 355ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } else { 356ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls stopped = 1; 357ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 358ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (unlikely (!HC_IS_RUNNING (ehci_to_hcd(ehci)->state))) 359ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls urb->status = -ESHUTDOWN; 360ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 361ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* ignore active urbs unless some previous qtd 362ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * for the urb faulted (including short read) or 363ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * its urb was canceled. we may patch qh or qtds. 364ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls */ 365ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (likely (urb->status == -EINPROGRESS)) 366ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls continue; 367ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 368ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* issue status after short control reads */ 369ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (unlikely (do_status != 0) 370ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls && QTD_PID (token) == 0 /* OUT */) { 371ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls do_status = 0; 372ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls continue; 373ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 374ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 375ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* token in overlay may be most current */ 376ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (state == QH_STATE_IDLE 377ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls && cpu_to_le32 (qtd->qtd_dma) 378deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls == qh->hw_current) 379ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls token = le32_to_cpu (qh->hw_token); 380ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 381ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* force halt for unlinked or blocked qh, so we'll 382ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * patch the qh later and so that completions can't 383deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls * activate it while we "know" it's stopped. 384ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls */ 385deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls if ((HALT_BIT & qh->hw_token) == 0) { 386deed75ed9f7576ada4bca02e6c851833a352a38dAndy Wallshalt: 387ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qh->hw_token |= HALT_BIT; 388ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls wmb (); 389deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls } 390ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 391ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 392ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* remove it from the queue */ 393ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls spin_lock (&urb->lock); 394ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd_copy_status (ehci, urb, qtd->length, token); 395ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls do_status = (urb->status == -EREMOTEIO) 396ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls && usb_pipecontrol (urb->pipe); 397deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls spin_unlock (&urb->lock); 3981c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 399990c81c8afcd71eced2482ad59950ea755eddc7fAl Viro if (stopped && qtd->qtd_list.prev != &qh->qtd_list) { 400ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls last = list_entry (qtd->qtd_list.prev, 4011c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil struct ehci_qtd, qtd_list); 402ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls last->hw_next = qtd->hw_next; 4031c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil } 4041c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil list_del (&qtd->qtd_list); 4051c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil last = qtd; 4061c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil } 4071c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 4081c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* last urb's completion might still need calling */ 4091c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (likely (last != NULL)) { 4101c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil ehci_urb_done (ehci, last->urb, regs); 4111c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil count++; 41272c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls ehci_qtd_free (ehci, last); 413ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 414ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 4151c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* restore original state; caller must unlink or relink */ 4161c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh->qh_state = state; 417ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 418ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* be sure the hardware's done with the qh before refreshing 419ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * it after fault cleanup, or recovering from silicon wrongly 42072a4f8081af1c53a1673c173ce0fdd85c4b7d403Andy Walls * overlaying the dummy qtd (which reduces DMA chatter). 421bca11a5721917d6d5874571813673a2669ffec4bAndy Walls */ 422bca11a5721917d6d5874571813673a2669ffec4bAndy Walls if (stopped != 0 || qh->hw_qtd_next == EHCI_LIST_END) { 423bca11a5721917d6d5874571813673a2669ffec4bAndy Walls switch (state) { 424bca11a5721917d6d5874571813673a2669ffec4bAndy Walls case QH_STATE_IDLE: 42572a4f8081af1c53a1673c173ce0fdd85c4b7d403Andy Walls qh_refresh(ehci, qh); 426ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls break; 42772a4f8081af1c53a1673c173ce0fdd85c4b7d403Andy Walls case QH_STATE_LINKED: 428ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* should be rare for periodic transfers, 429f056d29eebd2c8800cf42528ba0470c77a928821Andy Walls * except maybe high bandwidth ... 430ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls */ 431ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (qh->period) { 432ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls intr_deschedule (ehci, qh); 433deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls (void) qh_schedule (ehci, qh); 434ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } else 435ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls unlink_async (ehci, qh); 436ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls break; 437ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* otherwise, unlink already started */ 438ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 439ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 440ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 441ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls return count; 442ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls} 443ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 444ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls/*-------------------------------------------------------------------------*/ 44572a4f8081af1c53a1673c173ce0fdd85c4b7d403Andy Walls 446ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls// high bandwidth multiplier, as encoded in highspeed endpoint descriptors 447ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls#define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03)) 448ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls// ... and packet size, for any kind of endpoint descriptor 449ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls#define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff) 450ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 451ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls/* 45272a4f8081af1c53a1673c173ce0fdd85c4b7d403Andy Walls * reverse of qh_urb_transaction: free a list of TDs. 45372a4f8081af1c53a1673c173ce0fdd85c4b7d403Andy Walls * used for cleanup after errors, before HC sees an URB's TDs. 454ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls */ 455ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Wallsstatic void qtd_list_free ( 456ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls struct ehci_hcd *ehci, 457ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls struct urb *urb, 458ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls struct list_head *qtd_list 459deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls) { 460ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls struct list_head *entry, *temp; 461ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 462ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls list_for_each_safe (entry, temp, qtd_list) { 463ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls struct ehci_qtd *qtd; 464ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 465ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd = list_entry (entry, struct ehci_qtd, qtd_list); 466ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls list_del (&qtd->qtd_list); 467ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls ehci_qtd_free (ehci, qtd); 468ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 469ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls} 470ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 471ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls/* 472ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * create a list of filled qtds for this URB; won't link into qh. 47372a4f8081af1c53a1673c173ce0fdd85c4b7d403Andy Walls */ 474ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Wallsstatic struct list_head * 475ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Wallsqh_urb_transaction ( 476ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls struct ehci_hcd *ehci, 477ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls struct urb *urb, 478ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls struct list_head *head, 479ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls int flags 480deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls) { 481ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls struct ehci_qtd *qtd, *qtd_prev; 482ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls dma_addr_t buf; 483ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls int len, maxpacket; 484ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls int is_input; 485ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls u32 token; 486ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 487ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* 488ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * URBs map to sequences of QTDs: one logical transaction 48972a4f8081af1c53a1673c173ce0fdd85c4b7d403Andy Walls */ 490ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd = ehci_qtd_alloc (ehci, flags); 491ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (unlikely (!qtd)) 49272a4f8081af1c53a1673c173ce0fdd85c4b7d403Andy Walls return NULL; 493ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls list_add_tail (&qtd->qtd_list, head); 494ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd->urb = urb; 495ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 496ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls token = QTD_STS_ACTIVE; 497ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls token |= (EHCI_TUNE_CERR << 10); 498ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* for split transactions, SplitXState initialized to zero */ 499ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 500ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls len = urb->transfer_buffer_length; 501ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls is_input = usb_pipein (urb->pipe); 502ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (usb_pipecontrol (urb->pipe)) { 503ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* SETUP pid */ 504ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd_fill (qtd, urb->setup_dma, sizeof (struct usb_ctrlrequest), 505ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls token | (2 /* "setup" */ << 8), 8); 506ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 507ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* ... and always at least one more pid */ 508ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls token ^= QTD_TOGGLE; 5091c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd_prev = qtd; 5101c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd = ehci_qtd_alloc (ehci, flags); 511ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (unlikely (!qtd)) 512deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls goto cleanup; 513ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd->urb = urb; 514ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd_prev->hw_next = QTD_NEXT (qtd->qtd_dma); 515deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls list_add_tail (&qtd->qtd_list, head); 516ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 517deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls 518ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* 519ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * data transfer stage: buffer setup 520ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls */ 521ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (likely (len > 0)) 522ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls buf = urb->transfer_dma; 523ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls else 524ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls buf = 0; 525ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 526deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls /* for zero length DATA stages, STATUS is always IN */ 527deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls if (!buf || is_input) 528ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls token |= (1 /* "in" */ << 8); 529ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* else it's already initted to "out" pid (0 << 8) */ 530ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 531ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input)); 532ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 533ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* 534ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * buffer gets wrapped in one or more qtds; 535ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * last one may be "short" (including zero len) 536ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls * and may serve as a control status ack 537ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls */ 538ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls for (;;) { 539deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls int this_qtd_len; 540ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 541ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls this_qtd_len = qtd_fill (qtd, buf, len, token, maxpacket); 542ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls len -= this_qtd_len; 543ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls buf += this_qtd_len; 544ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (is_input) 545ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd->hw_alt_next = ehci->async->hw_alt_next; 546ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 547ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* qh makes control packets use qtd toggle; maybe switch it */ 548ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0) 549ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls token ^= QTD_TOGGLE; 550ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 551ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (likely (len <= 0)) 552ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls break; 553deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls 554ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd_prev = qtd; 555ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd = ehci_qtd_alloc (ehci, flags); 556ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (unlikely (!qtd)) 557ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls goto cleanup; 558ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd->urb = urb; 559ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd_prev->hw_next = QTD_NEXT (qtd->qtd_dma); 56072a4f8081af1c53a1673c173ce0fdd85c4b7d403Andy Walls list_add_tail (&qtd->qtd_list, head); 561ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 562ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 563d6c7e5f8faad080e75bace5c4f2265e3513e3510Andy Walls /* unless the bulk/interrupt caller wants a chance to clean 564d6c7e5f8faad080e75bace5c4f2265e3513e3510Andy Walls * up after short reads, hc should advance qh past this urb 565d6c7e5f8faad080e75bace5c4f2265e3513e3510Andy Walls */ 566d6c7e5f8faad080e75bace5c4f2265e3513e3510Andy Walls if (likely ((urb->transfer_flags & URB_SHORT_NOT_OK) == 0 567d6c7e5f8faad080e75bace5c4f2265e3513e3510Andy Walls || usb_pipecontrol (urb->pipe))) 568d6c7e5f8faad080e75bace5c4f2265e3513e3510Andy Walls qtd->hw_alt_next = EHCI_LIST_END; 569ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 570ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls /* 571bca11a5721917d6d5874571813673a2669ffec4bAndy Walls * control requests may need a terminating data "status" ack; 572bca11a5721917d6d5874571813673a2669ffec4bAndy Walls * bulk ones may need a terminating short packet (zero length). 573bca11a5721917d6d5874571813673a2669ffec4bAndy Walls */ 574bca11a5721917d6d5874571813673a2669ffec4bAndy Walls if (likely (buf != 0)) { 57550299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls int one_more = 0; 57650299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls 57772a4f8081af1c53a1673c173ce0fdd85c4b7d403Andy Walls if (usb_pipecontrol (urb->pipe)) { 578ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls one_more = 1; 579ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls token ^= 0x0100; /* "in" <--> "out" */ 580ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls token |= QTD_TOGGLE; /* force DATA1 */ 581ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } else if (usb_pipebulk (urb->pipe) 582ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls && (urb->transfer_flags & URB_ZERO_PACKET) 583ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls && !(urb->transfer_buffer_length % maxpacket)) { 58472a4f8081af1c53a1673c173ce0fdd85c4b7d403Andy Walls one_more = 1; 585ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls } 586deed75ed9f7576ada4bca02e6c851833a352a38dAndy Walls if (one_more) { 587ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd_prev = qtd; 588ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd = ehci_qtd_alloc (ehci, flags); 589ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls if (unlikely (!qtd)) 590ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls goto cleanup; 591ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd->urb = urb; 592ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls qtd_prev->hw_next = QTD_NEXT (qtd->qtd_dma); 593ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls list_add_tail (&qtd->qtd_list, head); 594ee2d64f5ccc71b5c5191e92ea91a12b65f9ca060Andy Walls 5951c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* never any data in such packets */ 5961c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd_fill (qtd, 0, 0, token, 0); 5971c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil } 598ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls } 599990c81c8afcd71eced2482ad59950ea755eddc7fAl Viro 600ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls /* by default, enable interrupt on urb completion */ 6011c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (likely (!(urb->transfer_flags & URB_NO_INTERRUPT))) 60272c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls qtd->hw_token |= __constant_cpu_to_le32 (QTD_IOC); 6035f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls return head; 6041c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 60550299994181b835e5a6ee2882df2ee07e7fb4491Andy Wallscleanup: 6065f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls qtd_list_free (ehci, urb, head); 6071c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil return NULL; 6081c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil} 6091c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 6101c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil/*-------------------------------------------------------------------------*/ 6111c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 6121c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil// Would be best to create all qh's from config descriptors, 61350299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls// when each interface/altsetting is established. Unlink 61450299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls// any previous qh and cancel its urbs first; endpoints are 61550299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls// implicitly reset then (data toggle too). 61650299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls// That'd mean updating how usbcore talks to HCDs. (2.7?) 61750299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls 61850299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls 61950299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls/* 62050299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls * Each QH holds a qtd list; a QH is used for everything except iso. 62150299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls * 62250299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls * For interrupt urbs, the scheduler must set the microframe scheduling 62350299994181b835e5a6ee2882df2ee07e7fb4491Andy Walls * mask(s) each time the QH gets scheduled. For highspeed, that's 62472c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls * just one microframe in the s-mask. For split interrupt transactions 62572c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls * there are additional complications: c-mask, maybe FSTNs. 62672c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls */ 62772c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Wallsstatic struct ehci_qh * 62872c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Wallsqh_make ( 629ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls struct ehci_hcd *ehci, 630ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls struct urb *urb, 631ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls int flags 63272c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls) { 63372c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls struct ehci_qh *qh = ehci_qh_alloc (ehci, flags); 63472c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls u32 info1 = 0, info2 = 0; 63572c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls int is_input, type; 636ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls int maxp = 0; 637ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls 638ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls if (!qh) 63972c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls return qh; 64072c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls 64172c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls /* 64272c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls * init endpoint/device data for this QH 64372c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls */ 64472c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls info1 |= usb_pipeendpoint (urb->pipe) << 8; 64572c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls info1 |= usb_pipedevice (urb->pipe) << 0; 646ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls 647ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls is_input = usb_pipein (urb->pipe); 648ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls type = usb_pipetype (urb->pipe); 649ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls maxp = usb_maxpacket (urb->dev, urb->pipe, !is_input); 650ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls 651ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls /* Compute interrupt scheduling parameters just once, and save. 652ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls * - allowing for high bandwidth, how many nsec/uframe are used? 653ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls * - split transactions need a second CSPLIT uframe; same question 654ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls * - splits also need a schedule gap (for full/low speed I/O) 655ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls * - qh has a polling interval 656ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls * 657ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls * For control/bulk requests, the HC or TT handles these. 6582bb49f1b9f6a4f50222bc8a6b1e9df87a432c52cAndy Walls */ 659ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls if (type == PIPE_INTERRUPT) { 660ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls qh->usecs = usb_calc_bus_time (USB_SPEED_HIGH, is_input, 0, 661330c6ec8942765e81f237bd58020da1b161935ceAndy Walls hb_mult (maxp) * max_packet (maxp)); 662ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls qh->start = NO_FRAME; 663ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls 664ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls if (urb->dev->speed == USB_SPEED_HIGH) { 665ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls qh->c_usecs = 0; 666ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls qh->gap_uf = 0; 667330c6ec8942765e81f237bd58020da1b161935ceAndy Walls 6682bb49f1b9f6a4f50222bc8a6b1e9df87a432c52cAndy Walls qh->period = urb->interval >> 3; 6692bb49f1b9f6a4f50222bc8a6b1e9df87a432c52cAndy Walls if (qh->period == 0 && urb->interval != 1) { 670ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls /* NOTE interval 2 or 4 uframes could work. 671ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls * But interval 1 scheduling is simpler, and 672ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls * includes high bandwidth. 6731c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil */ 674b1526421eac9a912b2cda7e147f1da2aa31be278Andy Walls dbg ("intr period %d uframes, NYET!", 6751c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil urb->interval); 676b1526421eac9a912b2cda7e147f1da2aa31be278Andy Walls goto done; 677b1526421eac9a912b2cda7e147f1da2aa31be278Andy Walls } 678b1526421eac9a912b2cda7e147f1da2aa31be278Andy Walls } else { 679ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls /* gap is f(FS/LS transfer times) */ 6801c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh->gap_uf = 1 + usb_calc_bus_time (urb->dev->speed, 681330c6ec8942765e81f237bd58020da1b161935ceAndy Walls is_input, 0, maxp) / (125 * 1000); 682330c6ec8942765e81f237bd58020da1b161935ceAndy Walls 683330c6ec8942765e81f237bd58020da1b161935ceAndy Walls /* FIXME this just approximates SPLIT/CSPLIT times */ 6842bb49f1b9f6a4f50222bc8a6b1e9df87a432c52cAndy Walls if (is_input) { // SPLIT, gap, CSPLIT+DATA 685ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls qh->c_usecs = qh->usecs + HS_USECS (0); 686ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls qh->usecs = HS_USECS (1); 687ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls } else { // SPLIT+DATA, gap, CSPLIT 6885f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls qh->usecs += HS_USECS (1); 6895f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls qh->c_usecs = HS_USECS (0); 6905f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls } 691f056d29eebd2c8800cf42528ba0470c77a928821Andy Walls 6921c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh->period = urb->interval; 6935f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls } 6945f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls } 6955f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls 6965f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls /* support for tt scheduling, and access to toggles */ 6975f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls qh->dev = usb_get_dev (urb->dev); 6985f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls 6995f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls /* using TT? */ 7005f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls switch (urb->dev->speed) { 7015f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls case USB_SPEED_LOW: 7025f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls info1 |= (1 << 12); /* EPS "low" */ 7035f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls /* FALL THROUGH */ 7042bb49f1b9f6a4f50222bc8a6b1e9df87a432c52cAndy Walls 7055f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls case USB_SPEED_FULL: 70672c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls /* EPS 0 means "full" */ 7075f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls if (type != PIPE_INTERRUPT) 7085f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls info1 |= (EHCI_TUNE_RL_TT << 28); 7095f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls if (type == PIPE_CONTROL) { 7105f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls info1 |= (1 << 27); /* for TT */ 7115f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls info1 |= 1 << 14; /* toggle from qtd */ 7125f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls } 7135f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls info1 |= maxp << 16; 7145f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls 7155f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls info2 |= (EHCI_TUNE_MULT_TT << 30); 7165f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls info2 |= urb->dev->ttport << 23; 7175f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls 7185f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls /* set the address of the TT; for TDI's integrated 7195f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls * root hub tt, leave it zeroed. 7205f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls */ 7211c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (!ehci_is_TDI(ehci) 722330c6ec8942765e81f237bd58020da1b161935ceAndy Walls || urb->dev->tt->hub != 723330c6ec8942765e81f237bd58020da1b161935ceAndy Walls ehci_to_hcd(ehci)->self.root_hub) 7245f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls info2 |= urb->dev->tt->hub->devnum << 16; 7255f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls 7265f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */ 7275f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls 7285f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls break; 729330c6ec8942765e81f237bd58020da1b161935ceAndy Walls 7305f0a3cfcfd315d87de8f80af49b114daf7137823Andy Walls case USB_SPEED_HIGH: /* no TT involved */ 73172c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls info1 |= (2 << 12); /* EPS "high" */ 732ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls if (type == PIPE_CONTROL) { 7331c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil info1 |= (EHCI_TUNE_RL_HS << 28); 734b1526421eac9a912b2cda7e147f1da2aa31be278Andy Walls info1 |= 64 << 16; /* usb2 fixed maxpacket */ 735b1526421eac9a912b2cda7e147f1da2aa31be278Andy Walls info1 |= 1 << 14; /* toggle from qtd */ 73672c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls info2 |= (EHCI_TUNE_MULT_HS << 30); 737ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls } else if (type == PIPE_BULK) { 738ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls info1 |= (EHCI_TUNE_RL_HS << 28); 739ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls info1 |= 512 << 16; /* usb2 fixed maxpacket */ 74052fcb3ecc6707f52dfe4297f96b7609d4ba517fbAndy Walls info2 |= (EHCI_TUNE_MULT_HS << 30); 741ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls } else { /* PIPE_INTERRUPT */ 742ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls info1 |= max_packet (maxp) << 16; 74372c2d6d3ac91d1b9efb482ff4a8dd68e3d867965Andy Walls info2 |= hb_mult (maxp) << 30; 7441c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil } 745ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls break; 7461c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil default: 7471c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil dbg ("bogus dev %p speed %d", urb->dev, urb->dev->speed); 7481c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuildone: 7491c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh_put (qh); 7501c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil return NULL; 7511c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil } 7521c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 7531c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */ 754ac50441720332f22a9d85ac03151d6acb7bc55d6Andy Walls 7551c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* init as live, toggle clear, advance to dummy */ 7561c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh->qh_state = QH_STATE_IDLE; 7571c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh->hw_info1 = cpu_to_le32 (info1); 7581c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh->hw_info2 = cpu_to_le32 (info2); 7591c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil usb_settoggle (urb->dev, usb_pipeendpoint (urb->pipe), !is_input, 1); 7601c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh_refresh (ehci, qh); 7611c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil return qh; 7621c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil} 7631c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 7641c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil/*-------------------------------------------------------------------------*/ 7651c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 7661c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil/* move qh (and its qtds) onto async queue; maybe enable queue. */ 7671c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 7681c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuilstatic void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh) 7691c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil{ 7701c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil __le32 dma = QH_NEXT (qh->qh_dma); 7711c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil struct ehci_qh *head; 7721c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 7731c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* (re)start the async schedule? */ 7741c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil head = ehci->async; 7751c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil timer_action_done (ehci, TIMER_ASYNC_OFF); 7761c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (!head->qh_next.qh) { 777a75b9be1c2fb52dee765d35f29031dd788d522ebHans Verkuil u32 cmd = readl (&ehci->regs->command); 778a75b9be1c2fb52dee765d35f29031dd788d522ebHans Verkuil 7791c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (!(cmd & CMD_ASE)) { 7801c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* in case a clear of CMD_ASE didn't take yet */ 7811c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil (void) handshake (&ehci->regs->status, STS_ASS, 0, 150); 7821c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil cmd |= CMD_ASE | CMD_RUN; 7831c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil writel (cmd, &ehci->regs->command); 7841c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil ehci_to_hcd(ehci)->state = HC_STATE_RUNNING; 7851c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* posted write need not be known to HC yet ... */ 7861c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil } 7871c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil } 7881c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 7891c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* clear halt and/or toggle; and maybe recover from silicon quirk */ 7901c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (qh->qh_state == QH_STATE_IDLE) 7911c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh_refresh (ehci, qh); 7921c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 7931c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* splice right after start */ 7941c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh->qh_next = head->qh_next; 7951c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh->hw_next = head->hw_next; 7961c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil wmb (); 7971c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 7981c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil head->qh_next.qh = qh; 7991c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil head->hw_next = dma; 8001c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 8011c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh->qh_state = QH_STATE_LINKED; 8021c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* qtd completions reported later by interrupt */ 8031c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil} 8041c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 8051c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil/*-------------------------------------------------------------------------*/ 8061c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 8071c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil#define QH_ADDR_MASK __constant_cpu_to_le32(0x7f) 8081c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 8091c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil/* 8101c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * For control/bulk/interrupt, return QH with these TDs appended. 8111c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * Allocates and initializes the QH if necessary. 8121c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * Returns null if it can't allocate a QH it needs to. 8131c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * If the QH has TDs (urbs) already, that's great. 8141c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil */ 8151c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuilstatic struct ehci_qh *qh_append_tds ( 8161c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil struct ehci_hcd *ehci, 8171c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil struct urb *urb, 8181c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil struct list_head *qtd_list, 8191c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil int epnum, 8201c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil void **ptr 8211c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil) 8221c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil{ 8231c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil struct ehci_qh *qh = NULL; 8241c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 8251c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh = (struct ehci_qh *) *ptr; 8261c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (unlikely (qh == NULL)) { 8271c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* can't sleep here, we have ehci->lock... */ 8281c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh = qh_make (ehci, urb, GFP_ATOMIC); 8291c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil *ptr = qh; 8301c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil } 8311c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (likely (qh != NULL)) { 8321c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil struct ehci_qtd *qtd; 8331c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 8341c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (unlikely (list_empty (qtd_list))) 8351c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd = NULL; 8361c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil else 8371c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd = list_entry (qtd_list->next, struct ehci_qtd, 8381c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd_list); 8391c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 8401c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* control qh may need patching ... */ 8411c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (unlikely (epnum == 0)) { 8421c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 8431c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* usb_reset_device() briefly reverts to address 0 */ 8441c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (usb_pipedevice (urb->pipe) == 0) 8451c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qh->hw_info1 &= ~QH_ADDR_MASK; 8461c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil } 8471c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 8481c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* just one way to queue requests: swap with the dummy qtd. 8491c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * only hc or qh_refresh() ever modify the overlay. 8501c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil */ 8511c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil if (likely (qtd != NULL)) { 8521c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil struct ehci_qtd *dummy; 8531c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil dma_addr_t dma; 8541c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil __le32 token; 8551c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 8561c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil /* to avoid racing the HC, use the dummy td instead of 8571c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * the first td of our list (becomes new dummy). both 8581c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * tds stay deactivated until we're done, when the 8591c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil * HC is allowed to fetch the old dummy (4.10.2). 8601c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil */ 8611c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil token = qtd->hw_token; 8621c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil qtd->hw_token = HALT_BIT; 8631c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil wmb (); 8641c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil dummy = qh->dummy; 8651c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 8661c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil dma = dummy->qtd_dma; 8671c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil *dummy = *qtd; 8681c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil dummy->qtd_dma = dma; 8691c1e45d17b663d4749af456ab7c2fc1f36405ef8Hans Verkuil 870 list_del (&qtd->qtd_list); 871 list_add (&dummy->qtd_list, qtd_list); 872 __list_splice (qtd_list, qh->qtd_list.prev); 873 874 ehci_qtd_init (qtd, qtd->qtd_dma); 875 qh->dummy = qtd; 876 877 /* hc must see the new dummy at list end */ 878 dma = qtd->qtd_dma; 879 qtd = list_entry (qh->qtd_list.prev, 880 struct ehci_qtd, qtd_list); 881 qtd->hw_next = QTD_NEXT (dma); 882 883 /* let the hc process these next qtds */ 884 wmb (); 885 dummy->hw_token = token; 886 887 urb->hcpriv = qh_get (qh); 888 } 889 } 890 return qh; 891} 892 893/*-------------------------------------------------------------------------*/ 894 895static int 896submit_async ( 897 struct ehci_hcd *ehci, 898 struct usb_host_endpoint *ep, 899 struct urb *urb, 900 struct list_head *qtd_list, 901 int mem_flags 902) { 903 struct ehci_qtd *qtd; 904 int epnum; 905 unsigned long flags; 906 struct ehci_qh *qh = NULL; 907 908 qtd = list_entry (qtd_list->next, struct ehci_qtd, qtd_list); 909 epnum = ep->desc.bEndpointAddress; 910 911#ifdef EHCI_URB_TRACE 912 ehci_dbg (ehci, 913 "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n", 914 __FUNCTION__, urb->dev->devpath, urb, 915 epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out", 916 urb->transfer_buffer_length, 917 qtd, ep->hcpriv); 918#endif 919 920 spin_lock_irqsave (&ehci->lock, flags); 921 qh = qh_append_tds (ehci, urb, qtd_list, epnum, &ep->hcpriv); 922 923 /* Control/bulk operations through TTs don't need scheduling, 924 * the HC and TT handle it when the TT has a buffer ready. 925 */ 926 if (likely (qh != NULL)) { 927 if (likely (qh->qh_state == QH_STATE_IDLE)) 928 qh_link_async (ehci, qh_get (qh)); 929 } 930 spin_unlock_irqrestore (&ehci->lock, flags); 931 if (unlikely (qh == NULL)) { 932 qtd_list_free (ehci, urb, qtd_list); 933 return -ENOMEM; 934 } 935 return 0; 936} 937 938/*-------------------------------------------------------------------------*/ 939 940/* the async qh for the qtds being reclaimed are now unlinked from the HC */ 941 942static void end_unlink_async (struct ehci_hcd *ehci, struct pt_regs *regs) 943{ 944 struct ehci_qh *qh = ehci->reclaim; 945 struct ehci_qh *next; 946 947 timer_action_done (ehci, TIMER_IAA_WATCHDOG); 948 949 // qh->hw_next = cpu_to_le32 (qh->qh_dma); 950 qh->qh_state = QH_STATE_IDLE; 951 qh->qh_next.qh = NULL; 952 qh_put (qh); // refcount from reclaim 953 954 /* other unlink(s) may be pending (in QH_STATE_UNLINK_WAIT) */ 955 next = qh->reclaim; 956 ehci->reclaim = next; 957 ehci->reclaim_ready = 0; 958 qh->reclaim = NULL; 959 960 qh_completions (ehci, qh, regs); 961 962 if (!list_empty (&qh->qtd_list) 963 && HC_IS_RUNNING (ehci_to_hcd(ehci)->state)) 964 qh_link_async (ehci, qh); 965 else { 966 qh_put (qh); // refcount from async list 967 968 /* it's not free to turn the async schedule on/off; leave it 969 * active but idle for a while once it empties. 970 */ 971 if (HC_IS_RUNNING (ehci_to_hcd(ehci)->state) 972 && ehci->async->qh_next.qh == NULL) 973 timer_action (ehci, TIMER_ASYNC_OFF); 974 } 975 976 if (next) { 977 ehci->reclaim = NULL; 978 start_unlink_async (ehci, next); 979 } 980} 981 982/* makes sure the async qh will become idle */ 983/* caller must own ehci->lock */ 984 985static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh) 986{ 987 int cmd = readl (&ehci->regs->command); 988 struct ehci_qh *prev; 989 990#ifdef DEBUG 991 assert_spin_locked(&ehci->lock); 992 if (ehci->reclaim 993 || (qh->qh_state != QH_STATE_LINKED 994 && qh->qh_state != QH_STATE_UNLINK_WAIT) 995 ) 996 BUG (); 997#endif 998 999 /* stop async schedule right now? */ 1000 if (unlikely (qh == ehci->async)) { 1001 /* can't get here without STS_ASS set */ 1002 if (ehci_to_hcd(ehci)->state != HC_STATE_HALT) { 1003 writel (cmd & ~CMD_ASE, &ehci->regs->command); 1004 wmb (); 1005 // handshake later, if we need to 1006 } 1007 timer_action_done (ehci, TIMER_ASYNC_OFF); 1008 return; 1009 } 1010 1011 qh->qh_state = QH_STATE_UNLINK; 1012 ehci->reclaim = qh = qh_get (qh); 1013 1014 prev = ehci->async; 1015 while (prev->qh_next.qh != qh) 1016 prev = prev->qh_next.qh; 1017 1018 prev->hw_next = qh->hw_next; 1019 prev->qh_next = qh->qh_next; 1020 wmb (); 1021 1022 if (unlikely (ehci_to_hcd(ehci)->state == HC_STATE_HALT)) { 1023 /* if (unlikely (qh->reclaim != 0)) 1024 * this will recurse, probably not much 1025 */ 1026 end_unlink_async (ehci, NULL); 1027 return; 1028 } 1029 1030 ehci->reclaim_ready = 0; 1031 cmd |= CMD_IAAD; 1032 writel (cmd, &ehci->regs->command); 1033 (void) readl (&ehci->regs->command); 1034 timer_action (ehci, TIMER_IAA_WATCHDOG); 1035} 1036 1037/*-------------------------------------------------------------------------*/ 1038 1039static void 1040scan_async (struct ehci_hcd *ehci, struct pt_regs *regs) 1041{ 1042 struct ehci_qh *qh; 1043 enum ehci_timer_action action = TIMER_IO_WATCHDOG; 1044 1045 if (!++(ehci->stamp)) 1046 ehci->stamp++; 1047 timer_action_done (ehci, TIMER_ASYNC_SHRINK); 1048rescan: 1049 qh = ehci->async->qh_next.qh; 1050 if (likely (qh != NULL)) { 1051 do { 1052 /* clean any finished work for this qh */ 1053 if (!list_empty (&qh->qtd_list) 1054 && qh->stamp != ehci->stamp) { 1055 int temp; 1056 1057 /* unlinks could happen here; completion 1058 * reporting drops the lock. rescan using 1059 * the latest schedule, but don't rescan 1060 * qhs we already finished (no looping). 1061 */ 1062 qh = qh_get (qh); 1063 qh->stamp = ehci->stamp; 1064 temp = qh_completions (ehci, qh, regs); 1065 qh_put (qh); 1066 if (temp != 0) { 1067 goto rescan; 1068 } 1069 } 1070 1071 /* unlink idle entries, reducing HC PCI usage as well 1072 * as HCD schedule-scanning costs. delay for any qh 1073 * we just scanned, there's a not-unusual case that it 1074 * doesn't stay idle for long. 1075 * (plus, avoids some kind of re-activation race.) 1076 */ 1077 if (list_empty (&qh->qtd_list)) { 1078 if (qh->stamp == ehci->stamp) 1079 action = TIMER_ASYNC_SHRINK; 1080 else if (!ehci->reclaim 1081 && qh->qh_state == QH_STATE_LINKED) 1082 start_unlink_async (ehci, qh); 1083 } 1084 1085 qh = qh->qh_next.qh; 1086 } while (qh); 1087 } 1088 if (action == TIMER_ASYNC_SHRINK) 1089 timer_action (ehci, TIMER_ASYNC_SHRINK); 1090} 1091