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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Universal Host Controller Interface driver for USB.
3 *
4 * Maintainer: Alan Stern <stern@rowland.harvard.edu>
5 *
6 * (C) Copyright 1999 Linus Torvalds
7 * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
8 * (C) Copyright 1999 Randy Dunlap
9 * (C) Copyright 1999 Georg Acher, acher@in.tum.de
10 * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
11 * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
12 * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
13 * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
14 * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
15 * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
Alan Stern17230ac2007-02-19 15:52:45 -050016 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 *
18 * Intel documents this fairly well, and as far as I know there
19 * are no royalties or anything like that, but even so there are
20 * people who decided that they want to do the same thing in a
21 * completely different way.
22 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 */
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/module.h>
26#include <linux/pci.h>
27#include <linux/kernel.h>
28#include <linux/init.h>
29#include <linux/delay.h>
30#include <linux/ioport.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/errno.h>
33#include <linux/unistd.h>
34#include <linux/interrupt.h>
35#include <linux/spinlock.h>
36#include <linux/debugfs.h>
37#include <linux/pm.h>
38#include <linux/dmapool.h>
39#include <linux/dma-mapping.h>
40#include <linux/usb.h>
Eric Lescouet27729aa2010-04-24 23:21:52 +020041#include <linux/usb/hcd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/bitops.h>
Alan Sternb62df452006-10-10 10:54:00 -040043#include <linux/dmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45#include <asm/uaccess.h>
46#include <asm/io.h>
47#include <asm/irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include "uhci-hcd.h"
50
51/*
52 * Version Information
53 */
Joe Perches85ee7a12011-04-23 20:38:19 -070054#define DRIVER_AUTHOR \
55 "Linus 'Frodo Rabbit' Torvalds, Johannes Erdfelt, " \
56 "Randy Dunlap, Georg Acher, Deti Fliegl, Thomas Sailer, " \
57 "Roman Weissgaerber, Alan Stern"
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#define DRIVER_DESC "USB Universal Host Controller Interface driver"
59
Alan Stern5f8364b2006-12-05 16:29:55 -050060/* for flakey hardware, ignore overcurrent indicators */
Rusty Russell90ab5ee2012-01-13 09:32:20 +103061static bool ignore_oc;
Alan Stern5f8364b2006-12-05 16:29:55 -050062module_param(ignore_oc, bool, S_IRUGO);
63MODULE_PARM_DESC(ignore_oc, "ignore hardware overcurrent indications");
64
Linus Torvalds1da177e2005-04-16 15:20:36 -070065/*
66 * debug = 0, no debugging messages
Alan Stern687f5f32005-11-30 17:16:19 -050067 * debug = 1, dump failed URBs except for stalls
68 * debug = 2, dump all failed URBs (including stalls)
GeunSik Lim837cbb02009-09-07 21:39:05 +090069 * show all queues in /sys/kernel/debug/uhci/[pci_addr]
Alan Stern687f5f32005-11-30 17:16:19 -050070 * debug = 3, show all TDs in URBs when dumping
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 */
72#ifdef DEBUG
Alan Stern8d402e12005-12-17 18:03:37 -050073#define DEBUG_CONFIGURED 1
Linus Torvalds1da177e2005-04-16 15:20:36 -070074static int debug = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075module_param(debug, int, S_IRUGO | S_IWUSR);
76MODULE_PARM_DESC(debug, "Debug level");
Alan Stern8d402e12005-12-17 18:03:37 -050077
78#else
79#define DEBUG_CONFIGURED 0
80#define debug 0
81#endif
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083static char *errbuf;
84#define ERRBUF_LEN (32 * 1024)
85
Christoph Lametere18b8902006-12-06 20:33:20 -080086static struct kmem_cache *uhci_up_cachep; /* urb_priv */
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Alan Stern6c1b4452005-04-21 16:04:58 -040088static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state);
89static void wakeup_rh(struct uhci_hcd *uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090static void uhci_get_current_frame_number(struct uhci_hcd *uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Alan Sternf3fe2392007-01-08 12:00:28 -050092/*
93 * Calculate the link pointer DMA value for the first Skeleton QH in a frame.
94 */
Jan Andersson51e2f622011-05-18 10:44:51 +020095static __hc32 uhci_frame_skel_link(struct uhci_hcd *uhci, int frame)
Alan Sternf3fe2392007-01-08 12:00:28 -050096{
97 int skelnum;
98
99 /*
100 * The interrupt queues will be interleaved as evenly as possible.
101 * There's not much to be done about period-1 interrupts; they have
102 * to occur in every frame. But we can schedule period-2 interrupts
103 * in odd-numbered frames, period-4 interrupts in frames congruent
104 * to 2 (mod 4), and so on. This way each frame only has two
105 * interrupt QHs, which will help spread out bandwidth utilization.
106 *
107 * ffs (Find First bit Set) does exactly what we need:
Alan Stern17230ac2007-02-19 15:52:45 -0500108 * 1,3,5,... => ffs = 0 => use period-2 QH = skelqh[8],
109 * 2,6,10,... => ffs = 1 => use period-4 QH = skelqh[7], etc.
Alan Sternf3fe2392007-01-08 12:00:28 -0500110 * ffs >= 7 => not on any high-period queue, so use
Alan Stern17230ac2007-02-19 15:52:45 -0500111 * period-1 QH = skelqh[9].
Alan Sternf3fe2392007-01-08 12:00:28 -0500112 * Add in UHCI_NUMFRAMES to insure at least one bit is set.
113 */
114 skelnum = 8 - (int) __ffs(frame | UHCI_NUMFRAMES);
115 if (skelnum <= 1)
116 skelnum = 9;
Jan Andersson51e2f622011-05-18 10:44:51 +0200117 return LINK_TO_QH(uhci, uhci->skelqh[skelnum]);
Alan Sternf3fe2392007-01-08 12:00:28 -0500118}
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120#include "uhci-debug.c"
121#include "uhci-q.c"
Alan Stern1f09df82005-09-05 13:59:51 -0400122#include "uhci-hub.c"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Alan Sterna8bed8b2005-04-09 17:29:00 -0400124/*
Alan Sternbb200f62005-10-03 16:36:29 -0400125 * Finish up a host controller reset and update the recorded state.
Alan Sterna8bed8b2005-04-09 17:29:00 -0400126 */
Alan Sternbb200f62005-10-03 16:36:29 -0400127static void finish_reset(struct uhci_hcd *uhci)
Alan Stern014e73c2005-04-09 17:24:42 -0400128{
Alan Sternc074b412005-04-22 14:39:12 -0400129 int port;
130
Alan Sternc074b412005-04-22 14:39:12 -0400131 /* HCRESET doesn't affect the Suspend, Reset, and Resume Detect
132 * bits in the port status and control registers.
133 * We have to clear them by hand.
134 */
135 for (port = 0; port < uhci->rh_numports; ++port)
Jan Andersson9faa0912011-05-06 12:00:16 +0200136 uhci_writew(uhci, 0, USBPORTSC1 + (port * 2));
Alan Sternc074b412005-04-22 14:39:12 -0400137
Alan Stern8e326402006-04-04 14:47:44 -0400138 uhci->port_c_suspend = uhci->resuming_ports = 0;
Alan Sternc8f4fe42005-04-09 17:27:32 -0400139 uhci->rh_state = UHCI_RH_RESET;
Alan Sterna8bed8b2005-04-09 17:29:00 -0400140 uhci->is_stopped = UHCI_IS_STOPPED;
Alan Stern541c7d42010-06-22 16:39:10 -0400141 clear_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
Alan Stern014e73c2005-04-09 17:24:42 -0400142}
143
Alan Sterna8bed8b2005-04-09 17:29:00 -0400144/*
Alan Stern4daaa872005-04-09 17:30:08 -0400145 * Last rites for a defunct/nonfunctional controller
Alan Stern02597d22005-04-28 14:51:27 -0400146 * or one we don't want to use any more.
Alan Stern4daaa872005-04-09 17:30:08 -0400147 */
Alan Sterne323de42006-06-05 12:21:30 -0400148static void uhci_hc_died(struct uhci_hcd *uhci)
Alan Stern4daaa872005-04-09 17:30:08 -0400149{
Alan Sterne323de42006-06-05 12:21:30 -0400150 uhci_get_current_frame_number(uhci);
Jan Anderssone7652e12011-05-06 12:00:13 +0200151 uhci->reset_hc(uhci);
Alan Sternbb200f62005-10-03 16:36:29 -0400152 finish_reset(uhci);
Alan Sterne323de42006-06-05 12:21:30 -0400153 uhci->dead = 1;
154
155 /* The current frame may already be partway finished */
156 ++uhci->frame_number;
Alan Stern4daaa872005-04-09 17:30:08 -0400157}
158
159/*
David Brownellbe3cbc52006-06-05 12:16:39 -0400160 * Initialize a controller that was newly discovered or has lost power
161 * or otherwise been reset while it was suspended. In none of these cases
162 * can we be sure of its previous state.
Alan Sterna8bed8b2005-04-09 17:29:00 -0400163 */
164static void check_and_reset_hc(struct uhci_hcd *uhci)
165{
Jan Anderssone7652e12011-05-06 12:00:13 +0200166 if (uhci->check_and_reset_hc(uhci))
Alan Sternbb200f62005-10-03 16:36:29 -0400167 finish_reset(uhci);
Alan Sterna8bed8b2005-04-09 17:29:00 -0400168}
169
Jan Anderssond3219d12011-05-06 12:00:17 +0200170#if defined(CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC)
171/*
172 * The two functions below are generic reset functions that are used on systems
173 * that do not have keyboard and mouse legacy support. We assume that we are
174 * running on such a system if CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC is defined.
175 */
176
177/*
178 * Make sure the controller is completely inactive, unable to
179 * generate interrupts or do DMA.
180 */
181static void uhci_generic_reset_hc(struct uhci_hcd *uhci)
182{
183 /* Reset the HC - this will force us to get a
184 * new notification of any already connected
185 * ports due to the virtual disconnect that it
186 * implies.
187 */
188 uhci_writew(uhci, USBCMD_HCRESET, USBCMD);
189 mb();
190 udelay(5);
191 if (uhci_readw(uhci, USBCMD) & USBCMD_HCRESET)
192 dev_warn(uhci_dev(uhci), "HCRESET not completed yet!\n");
193
194 /* Just to be safe, disable interrupt requests and
195 * make sure the controller is stopped.
196 */
197 uhci_writew(uhci, 0, USBINTR);
198 uhci_writew(uhci, 0, USBCMD);
199}
200
201/*
202 * Initialize a controller that was newly discovered or has just been
203 * resumed. In either case we can't be sure of its previous state.
204 *
205 * Returns: 1 if the controller was reset, 0 otherwise.
206 */
207static int uhci_generic_check_and_reset_hc(struct uhci_hcd *uhci)
208{
209 unsigned int cmd, intr;
210
211 /*
212 * When restarting a suspended controller, we expect all the
213 * settings to be the same as we left them:
214 *
215 * Controller is stopped and configured with EGSM set;
216 * No interrupts enabled except possibly Resume Detect.
217 *
218 * If any of these conditions are violated we do a complete reset.
219 */
220
221 cmd = uhci_readw(uhci, USBCMD);
222 if ((cmd & USBCMD_RS) || !(cmd & USBCMD_CF) || !(cmd & USBCMD_EGSM)) {
223 dev_dbg(uhci_dev(uhci), "%s: cmd = 0x%04x\n",
224 __func__, cmd);
225 goto reset_needed;
226 }
227
228 intr = uhci_readw(uhci, USBINTR);
229 if (intr & (~USBINTR_RESUME)) {
230 dev_dbg(uhci_dev(uhci), "%s: intr = 0x%04x\n",
231 __func__, intr);
232 goto reset_needed;
233 }
234 return 0;
235
236reset_needed:
237 dev_dbg(uhci_dev(uhci), "Performing full reset\n");
238 uhci_generic_reset_hc(uhci);
239 return 1;
240}
241#endif /* CONFIG_USB_UHCI_SUPPORT_NON_PCI_HC */
242
Alan Sterna8bed8b2005-04-09 17:29:00 -0400243/*
244 * Store the basic register settings needed by the controller.
245 */
246static void configure_hc(struct uhci_hcd *uhci)
247{
248 /* Set the frame length to the default: 1 ms exactly */
Jan Andersson9faa0912011-05-06 12:00:16 +0200249 uhci_writeb(uhci, USBSOF_DEFAULT, USBSOF);
Alan Sterna8bed8b2005-04-09 17:29:00 -0400250
251 /* Store the frame list base address */
Jan Andersson9faa0912011-05-06 12:00:16 +0200252 uhci_writel(uhci, uhci->frame_dma_handle, USBFLBASEADD);
Alan Sterna8bed8b2005-04-09 17:29:00 -0400253
254 /* Set the current frame number */
Jan Andersson9faa0912011-05-06 12:00:16 +0200255 uhci_writew(uhci, uhci->frame_number & UHCI_MAX_SOF_NUMBER,
256 USBFRNUM);
Alan Sterna8bed8b2005-04-09 17:29:00 -0400257
Jan Anderssone7652e12011-05-06 12:00:13 +0200258 /* perform any arch/bus specific configuration */
259 if (uhci->configure_hc)
260 uhci->configure_hc(uhci);
Alan Sterna8bed8b2005-04-09 17:29:00 -0400261}
262
Alan Sternc8f4fe42005-04-09 17:27:32 -0400263static int resume_detect_interrupts_are_broken(struct uhci_hcd *uhci)
Alan Stern014e73c2005-04-09 17:24:42 -0400264{
Alan Stern5f8364b2006-12-05 16:29:55 -0500265 /* If we have to ignore overcurrent events then almost by definition
266 * we can't depend on resume-detect interrupts. */
267 if (ignore_oc)
268 return 1;
269
Jan Anderssone7652e12011-05-06 12:00:13 +0200270 return uhci->resume_detect_interrupts_are_broken ?
271 uhci->resume_detect_interrupts_are_broken(uhci) : 0;
Alan Sternc8f4fe42005-04-09 17:27:32 -0400272}
273
Alan Sternd8f12ab2008-04-22 10:49:15 -0400274static int global_suspend_mode_is_broken(struct uhci_hcd *uhci)
Alan Sternb62df452006-10-10 10:54:00 -0400275{
Jan Anderssone7652e12011-05-06 12:00:13 +0200276 return uhci->global_suspend_mode_is_broken ?
277 uhci->global_suspend_mode_is_broken(uhci) : 0;
Alan Sternb62df452006-10-10 10:54:00 -0400278}
279
Alan Sterna8bed8b2005-04-09 17:29:00 -0400280static void suspend_rh(struct uhci_hcd *uhci, enum uhci_rh_state new_state)
Alan Sternc8f4fe42005-04-09 17:27:32 -0400281__releases(uhci->lock)
282__acquires(uhci->lock)
283{
284 int auto_stop;
Alan Sternd8f12ab2008-04-22 10:49:15 -0400285 int int_enable, egsm_enable, wakeup_enable;
Alan Stern58a97ff2008-04-14 12:17:10 -0400286 struct usb_device *rhdev = uhci_to_hcd(uhci)->self.root_hub;
Alan Sternc8f4fe42005-04-09 17:27:32 -0400287
288 auto_stop = (new_state == UHCI_RH_AUTO_STOPPED);
Alan Stern58a97ff2008-04-14 12:17:10 -0400289 dev_dbg(&rhdev->dev, "%s%s\n", __func__,
Alan Sternc8f4fe42005-04-09 17:27:32 -0400290 (auto_stop ? " (auto-stop)" : ""));
291
Alan Sternd8f12ab2008-04-22 10:49:15 -0400292 /* Start off by assuming Resume-Detect interrupts and EGSM work
293 * and that remote wakeups should be enabled.
Alan Sternc8f4fe42005-04-09 17:27:32 -0400294 */
Alan Sternb62df452006-10-10 10:54:00 -0400295 egsm_enable = USBCMD_EGSM;
Alan Stern1f09df82005-09-05 13:59:51 -0400296 int_enable = USBINTR_RESUME;
Alan Sternd8f12ab2008-04-22 10:49:15 -0400297 wakeup_enable = 1;
298
Alan Stern5c12e782011-09-26 11:25:26 -0400299 /*
300 * In auto-stop mode, we must be able to detect new connections.
301 * The user can force us to poll by disabling remote wakeup;
302 * otherwise we will use the EGSM/RD mechanism.
Alan Sternd8f12ab2008-04-22 10:49:15 -0400303 */
304 if (auto_stop) {
305 if (!device_may_wakeup(&rhdev->dev))
Alan Stern5c12e782011-09-26 11:25:26 -0400306 egsm_enable = int_enable = 0;
Alan Sternd8f12ab2008-04-22 10:49:15 -0400307 }
308
Alan Stern5c12e782011-09-26 11:25:26 -0400309#ifdef CONFIG_PM
310 /*
311 * In bus-suspend mode, we use the wakeup setting specified
312 * for the root hub.
Alan Sternd8f12ab2008-04-22 10:49:15 -0400313 */
Alan Stern5c12e782011-09-26 11:25:26 -0400314 else {
315 if (!rhdev->do_remote_wakeup)
316 wakeup_enable = 0;
317 }
318#endif
Alan Sternd8f12ab2008-04-22 10:49:15 -0400319
Alan Stern5c12e782011-09-26 11:25:26 -0400320 /*
321 * UHCI doesn't distinguish between wakeup requests from downstream
322 * devices and local connect/disconnect events. There's no way to
323 * enable one without the other; both are controlled by EGSM. Thus
324 * if wakeups are disallowed then EGSM must be turned off -- in which
325 * case remote wakeup requests from downstream during system sleep
326 * will be lost.
Alan Sternd8f12ab2008-04-22 10:49:15 -0400327 *
Alan Stern5c12e782011-09-26 11:25:26 -0400328 * In addition, if EGSM is broken then we can't use it. Likewise,
329 * if Resume-Detect interrupts are broken then we can't use them.
330 *
331 * Finally, neither EGSM nor RD is useful by itself. Without EGSM,
332 * the RD status bit will never get set. Without RD, the controller
333 * won't generate interrupts to tell the system about wakeup events.
Alan Sternd8f12ab2008-04-22 10:49:15 -0400334 */
Alan Stern5c12e782011-09-26 11:25:26 -0400335 if (!wakeup_enable || global_suspend_mode_is_broken(uhci) ||
336 resume_detect_interrupts_are_broken(uhci))
337 egsm_enable = int_enable = 0;
Alan Sternb62df452006-10-10 10:54:00 -0400338
Alan Stern5c12e782011-09-26 11:25:26 -0400339 uhci->RD_enable = !!int_enable;
Jan Andersson9faa0912011-05-06 12:00:16 +0200340 uhci_writew(uhci, int_enable, USBINTR);
341 uhci_writew(uhci, egsm_enable | USBCMD_CF, USBCMD);
Alan Sterna8bed8b2005-04-09 17:29:00 -0400342 mb();
Alan Sternc8f4fe42005-04-09 17:27:32 -0400343 udelay(5);
344
345 /* If we're auto-stopping then no devices have been attached
346 * for a while, so there shouldn't be any active URBs and the
347 * controller should stop after a few microseconds. Otherwise
348 * we will give the controller one frame to stop.
349 */
Jan Andersson9faa0912011-05-06 12:00:16 +0200350 if (!auto_stop && !(uhci_readw(uhci, USBSTS) & USBSTS_HCH)) {
Alan Sternc8f4fe42005-04-09 17:27:32 -0400351 uhci->rh_state = UHCI_RH_SUSPENDING;
352 spin_unlock_irq(&uhci->lock);
353 msleep(1);
354 spin_lock_irq(&uhci->lock);
Alan Sterne323de42006-06-05 12:21:30 -0400355 if (uhci->dead)
Alan Stern4daaa872005-04-09 17:30:08 -0400356 return;
Alan Sternc8f4fe42005-04-09 17:27:32 -0400357 }
Jan Andersson9faa0912011-05-06 12:00:16 +0200358 if (!(uhci_readw(uhci, USBSTS) & USBSTS_HCH))
Alan Stern58a97ff2008-04-14 12:17:10 -0400359 dev_warn(uhci_dev(uhci), "Controller not stopped yet!\n");
Alan Sternc8f4fe42005-04-09 17:27:32 -0400360
Alan Stern014e73c2005-04-09 17:24:42 -0400361 uhci_get_current_frame_number(uhci);
Alan Sternc8f4fe42005-04-09 17:27:32 -0400362
363 uhci->rh_state = new_state;
Alan Stern014e73c2005-04-09 17:24:42 -0400364 uhci->is_stopped = UHCI_IS_STOPPED;
Alan Sternd8f12ab2008-04-22 10:49:15 -0400365
Alan Stern5c12e782011-09-26 11:25:26 -0400366 /*
367 * If remote wakeup is enabled but either EGSM or RD interrupts
368 * doesn't work, then we won't get an interrupt when a wakeup event
369 * occurs. Thus the suspended root hub needs to be polled.
Alan Sternd8f12ab2008-04-22 10:49:15 -0400370 */
Alan Stern5c12e782011-09-26 11:25:26 -0400371 if (wakeup_enable && (!int_enable || !egsm_enable))
Alan Stern541c7d42010-06-22 16:39:10 -0400372 set_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
373 else
374 clear_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
Alan Stern014e73c2005-04-09 17:24:42 -0400375
David Howells7d12e782006-10-05 14:55:46 +0100376 uhci_scan_schedule(uhci);
Alan Stern84afddd2006-05-12 11:35:45 -0400377 uhci_fsbr_off(uhci);
Alan Stern014e73c2005-04-09 17:24:42 -0400378}
379
Alan Sterna8bed8b2005-04-09 17:29:00 -0400380static void start_rh(struct uhci_hcd *uhci)
381{
Alan Sterna8bed8b2005-04-09 17:29:00 -0400382 uhci->is_stopped = 0;
Alan Sterna8bed8b2005-04-09 17:29:00 -0400383
384 /* Mark it configured and running with a 64-byte max packet.
385 * All interrupts are enabled, even though RESUME won't do anything.
386 */
Jan Andersson9faa0912011-05-06 12:00:16 +0200387 uhci_writew(uhci, USBCMD_RS | USBCMD_CF | USBCMD_MAXP, USBCMD);
388 uhci_writew(uhci, USBINTR_TIMEOUT | USBINTR_RESUME |
389 USBINTR_IOC | USBINTR_SP, USBINTR);
Alan Sterna8bed8b2005-04-09 17:29:00 -0400390 mb();
Alan Stern6c1b4452005-04-21 16:04:58 -0400391 uhci->rh_state = UHCI_RH_RUNNING;
Alan Stern541c7d42010-06-22 16:39:10 -0400392 set_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
Alan Sterna8bed8b2005-04-09 17:29:00 -0400393}
394
395static void wakeup_rh(struct uhci_hcd *uhci)
Alan Sternc8f4fe42005-04-09 17:27:32 -0400396__releases(uhci->lock)
397__acquires(uhci->lock)
Alan Stern014e73c2005-04-09 17:24:42 -0400398{
David Brownellbe3cbc52006-06-05 12:16:39 -0400399 dev_dbg(&uhci_to_hcd(uhci)->self.root_hub->dev,
Harvey Harrison441b62c2008-03-03 16:08:34 -0800400 "%s%s\n", __func__,
Alan Sternc8f4fe42005-04-09 17:27:32 -0400401 uhci->rh_state == UHCI_RH_AUTO_STOPPED ?
402 " (auto-start)" : "");
Alan Stern014e73c2005-04-09 17:24:42 -0400403
Alan Sternc8f4fe42005-04-09 17:27:32 -0400404 /* If we are auto-stopped then no devices are attached so there's
405 * no need for wakeup signals. Otherwise we send Global Resume
406 * for 20 ms.
407 */
408 if (uhci->rh_state == UHCI_RH_SUSPENDED) {
Alan Sternd8f12ab2008-04-22 10:49:15 -0400409 unsigned egsm;
410
411 /* Keep EGSM on if it was set before */
Jan Andersson9faa0912011-05-06 12:00:16 +0200412 egsm = uhci_readw(uhci, USBCMD) & USBCMD_EGSM;
Alan Sternc8f4fe42005-04-09 17:27:32 -0400413 uhci->rh_state = UHCI_RH_RESUMING;
Jan Andersson9faa0912011-05-06 12:00:16 +0200414 uhci_writew(uhci, USBCMD_FGR | USBCMD_CF | egsm, USBCMD);
Alan Sternc8f4fe42005-04-09 17:27:32 -0400415 spin_unlock_irq(&uhci->lock);
416 msleep(20);
417 spin_lock_irq(&uhci->lock);
Alan Sterne323de42006-06-05 12:21:30 -0400418 if (uhci->dead)
Alan Stern4daaa872005-04-09 17:30:08 -0400419 return;
Alan Stern014e73c2005-04-09 17:24:42 -0400420
Alan Sternc8f4fe42005-04-09 17:27:32 -0400421 /* End Global Resume and wait for EOP to be sent */
Jan Andersson9faa0912011-05-06 12:00:16 +0200422 uhci_writew(uhci, USBCMD_CF, USBCMD);
Alan Sterna8bed8b2005-04-09 17:29:00 -0400423 mb();
Alan Sternc8f4fe42005-04-09 17:27:32 -0400424 udelay(4);
Jan Andersson9faa0912011-05-06 12:00:16 +0200425 if (uhci_readw(uhci, USBCMD) & USBCMD_FGR)
Alan Sternc8f4fe42005-04-09 17:27:32 -0400426 dev_warn(uhci_dev(uhci), "FGR not stopped yet!\n");
Alan Stern014e73c2005-04-09 17:24:42 -0400427 }
Alan Sternc8f4fe42005-04-09 17:27:32 -0400428
Alan Sterna8bed8b2005-04-09 17:29:00 -0400429 start_rh(uhci);
Alan Stern014e73c2005-04-09 17:24:42 -0400430
Alan Stern6c1b4452005-04-21 16:04:58 -0400431 /* Restart root hub polling */
432 mod_timer(&uhci_to_hcd(uhci)->rh_timer, jiffies);
Alan Stern014e73c2005-04-09 17:24:42 -0400433}
434
David Howells7d12e782006-10-05 14:55:46 +0100435static irqreturn_t uhci_irq(struct usb_hcd *hcd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436{
437 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 unsigned short status;
439
440 /*
441 * Read the interrupt status, and write it back to clear the
442 * interrupt cause. Contrary to the UHCI specification, the
443 * "HC Halted" status bit is persistent: it is RO, not R/WC.
444 */
Jan Andersson9faa0912011-05-06 12:00:16 +0200445 status = uhci_readw(uhci, USBSTS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 if (!(status & ~USBSTS_HCH)) /* shared interrupt, not mine */
447 return IRQ_NONE;
Jan Andersson9faa0912011-05-06 12:00:16 +0200448 uhci_writew(uhci, status, USBSTS); /* Clear it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450 if (status & ~(USBSTS_USBINT | USBSTS_ERROR | USBSTS_RD)) {
451 if (status & USBSTS_HSE)
452 dev_err(uhci_dev(uhci), "host system error, "
453 "PCI problems?\n");
454 if (status & USBSTS_HCPE)
455 dev_err(uhci_dev(uhci), "host controller process "
456 "error, something bad happened!\n");
Alan Stern4daaa872005-04-09 17:30:08 -0400457 if (status & USBSTS_HCH) {
Alan Stern442258e2007-12-06 14:47:08 -0500458 spin_lock(&uhci->lock);
Alan Stern4daaa872005-04-09 17:30:08 -0400459 if (uhci->rh_state >= UHCI_RH_RUNNING) {
460 dev_err(uhci_dev(uhci),
461 "host controller halted, "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 "very bad!\n");
Alan Stern8d402e12005-12-17 18:03:37 -0500463 if (debug > 1 && errbuf) {
464 /* Print the schedule for debugging */
465 uhci_sprint_schedule(uhci,
466 errbuf, ERRBUF_LEN);
467 lprintk(errbuf);
468 }
Alan Sterne323de42006-06-05 12:21:30 -0400469 uhci_hc_died(uhci);
Alan Stern7d670a22011-04-05 13:36:04 -0400470 usb_hc_died(hcd);
Alan Stern1f09df82005-09-05 13:59:51 -0400471
472 /* Force a callback in case there are
473 * pending unlinks */
474 mod_timer(&hcd->rh_timer, jiffies);
Alan Stern4daaa872005-04-09 17:30:08 -0400475 }
Alan Stern442258e2007-12-06 14:47:08 -0500476 spin_unlock(&uhci->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 }
478 }
479
480 if (status & USBSTS_RD)
Alan Stern6c1b4452005-04-21 16:04:58 -0400481 usb_hcd_poll_rh_status(hcd);
Alan Stern1f09df82005-09-05 13:59:51 -0400482 else {
Alan Stern442258e2007-12-06 14:47:08 -0500483 spin_lock(&uhci->lock);
David Howells7d12e782006-10-05 14:55:46 +0100484 uhci_scan_schedule(uhci);
Alan Stern442258e2007-12-06 14:47:08 -0500485 spin_unlock(&uhci->lock);
Alan Stern1f09df82005-09-05 13:59:51 -0400486 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488 return IRQ_HANDLED;
489}
490
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491/*
492 * Store the current frame number in uhci->frame_number if the controller
Justin P. Mattock06125be2011-02-26 20:33:57 -0800493 * is running. Expand from 11 bits (of which we use only 10) to a
Alan Sternc4334722006-05-19 16:34:57 -0400494 * full-sized integer.
495 *
496 * Like many other parts of the driver, this code relies on being polled
497 * more than once per second as long as the controller is running.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 */
499static void uhci_get_current_frame_number(struct uhci_hcd *uhci)
500{
Alan Sternc4334722006-05-19 16:34:57 -0400501 if (!uhci->is_stopped) {
502 unsigned delta;
503
Jan Andersson9faa0912011-05-06 12:00:16 +0200504 delta = (uhci_readw(uhci, USBFRNUM) - uhci->frame_number) &
Alan Sternc4334722006-05-19 16:34:57 -0400505 (UHCI_NUMFRAMES - 1);
506 uhci->frame_number += delta;
507 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508}
509
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510/*
511 * De-allocate all resources
512 */
513static void release_uhci(struct uhci_hcd *uhci)
514{
515 int i;
516
Alan Stern8d402e12005-12-17 18:03:37 -0500517 if (DEBUG_CONFIGURED) {
518 spin_lock_irq(&uhci->lock);
519 uhci->is_initialized = 0;
520 spin_unlock_irq(&uhci->lock);
521
522 debugfs_remove(uhci->dentry);
523 }
524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 for (i = 0; i < UHCI_NUM_SKELQH; i++)
Alan Stern8b4cd422005-09-16 14:17:45 -0400526 uhci_free_qh(uhci, uhci->skelqh[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Alan Stern8b4cd422005-09-16 14:17:45 -0400528 uhci_free_td(uhci, uhci->term_td);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Alan Stern8b4cd422005-09-16 14:17:45 -0400530 dma_pool_destroy(uhci->qh_pool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
Alan Stern8b4cd422005-09-16 14:17:45 -0400532 dma_pool_destroy(uhci->td_pool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
Alan Sterna1d59ce2005-09-16 14:22:51 -0400534 kfree(uhci->frame_cpu);
535
536 dma_free_coherent(uhci_dev(uhci),
537 UHCI_NUMFRAMES * sizeof(*uhci->frame),
538 uhci->frame, uhci->frame_dma_handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539}
540
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541/*
542 * Allocate a frame list, and then setup the skeleton
543 *
544 * The hardware doesn't really know any difference
545 * in the queues, but the order does matter for the
Alan Stern17230ac2007-02-19 15:52:45 -0500546 * protocols higher up. The order in which the queues
547 * are encountered by the hardware is:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 *
Alan Stern17230ac2007-02-19 15:52:45 -0500549 * - All isochronous events are handled before any
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 * of the queues. We don't do that here, because
551 * we'll create the actual TD entries on demand.
Alan Stern17230ac2007-02-19 15:52:45 -0500552 * - The first queue is the high-period interrupt queue.
553 * - The second queue is the period-1 interrupt and async
554 * (low-speed control, full-speed control, then bulk) queue.
555 * - The third queue is the terminating bandwidth reclamation queue,
556 * which contains no members, loops back to itself, and is present
557 * only when FSBR is on and there are no full-speed control or bulk QHs.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 */
559static int uhci_start(struct usb_hcd *hcd)
560{
561 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
562 int retval = -EBUSY;
Alan Sternc074b412005-04-22 14:39:12 -0400563 int i;
Alan Sternb4092142010-08-05 13:12:14 -0400564 struct dentry __maybe_unused *dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
Alan Stern6c1b4452005-04-21 16:04:58 -0400566 hcd->uses_new_polling = 1;
Sebastian Andrzej Siewior28517842012-01-13 19:04:17 +0100567 /* Accept arbitrarily long scatter-gather lists */
568 if (!(hcd->driver->flags & HCD_LOCAL_MEM))
569 hcd->self.sg_tablesize = ~0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 spin_lock_init(&uhci->lock);
Alan Sternc5e3b742006-06-05 12:28:57 -0400572 setup_timer(&uhci->fsbr_timer, uhci_fsbr_timeout,
573 (unsigned long) uhci);
Alan Sterndccf4a42005-12-17 17:58:46 -0500574 INIT_LIST_HEAD(&uhci->idle_qh_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 init_waitqueue_head(&uhci->waitqh);
576
Alan Sternb4092142010-08-05 13:12:14 -0400577#ifdef UHCI_DEBUG_OPS
578 dentry = debugfs_create_file(hcd->self.bus_name,
579 S_IFREG|S_IRUGO|S_IWUSR, uhci_debugfs_root,
580 uhci, &uhci_debug_operations);
581 if (!dentry) {
582 dev_err(uhci_dev(uhci), "couldn't create uhci debugfs entry\n");
583 return -ENOMEM;
Alan Stern8d402e12005-12-17 18:03:37 -0500584 }
Alan Sternb4092142010-08-05 13:12:14 -0400585 uhci->dentry = dentry;
586#endif
Alan Stern8d402e12005-12-17 18:03:37 -0500587
Alan Sterna1d59ce2005-09-16 14:22:51 -0400588 uhci->frame = dma_alloc_coherent(uhci_dev(uhci),
589 UHCI_NUMFRAMES * sizeof(*uhci->frame),
590 &uhci->frame_dma_handle, 0);
591 if (!uhci->frame) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 dev_err(uhci_dev(uhci), "unable to allocate "
593 "consistent memory for frame list\n");
Alan Sterna1d59ce2005-09-16 14:22:51 -0400594 goto err_alloc_frame;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 }
Alan Sterna1d59ce2005-09-16 14:22:51 -0400596 memset(uhci->frame, 0, UHCI_NUMFRAMES * sizeof(*uhci->frame));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
Alan Sterna1d59ce2005-09-16 14:22:51 -0400598 uhci->frame_cpu = kcalloc(UHCI_NUMFRAMES, sizeof(*uhci->frame_cpu),
599 GFP_KERNEL);
600 if (!uhci->frame_cpu) {
601 dev_err(uhci_dev(uhci), "unable to allocate "
602 "memory for frame pointers\n");
603 goto err_alloc_frame_cpu;
604 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
606 uhci->td_pool = dma_pool_create("uhci_td", uhci_dev(uhci),
607 sizeof(struct uhci_td), 16, 0);
608 if (!uhci->td_pool) {
609 dev_err(uhci_dev(uhci), "unable to create td dma_pool\n");
610 goto err_create_td_pool;
611 }
612
613 uhci->qh_pool = dma_pool_create("uhci_qh", uhci_dev(uhci),
614 sizeof(struct uhci_qh), 16, 0);
615 if (!uhci->qh_pool) {
616 dev_err(uhci_dev(uhci), "unable to create qh dma_pool\n");
617 goto err_create_qh_pool;
618 }
619
Alan Stern25321782005-04-25 11:14:31 -0400620 uhci->term_td = uhci_alloc_td(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 if (!uhci->term_td) {
622 dev_err(uhci_dev(uhci), "unable to allocate terminating TD\n");
623 goto err_alloc_term_td;
624 }
625
626 for (i = 0; i < UHCI_NUM_SKELQH; i++) {
Alan Sterndccf4a42005-12-17 17:58:46 -0500627 uhci->skelqh[i] = uhci_alloc_qh(uhci, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 if (!uhci->skelqh[i]) {
629 dev_err(uhci_dev(uhci), "unable to allocate QH\n");
630 goto err_alloc_skelqh;
631 }
632 }
633
634 /*
Alan Stern17230ac2007-02-19 15:52:45 -0500635 * 8 Interrupt queues; link all higher int queues to int1 = async
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 */
Alan Stern17230ac2007-02-19 15:52:45 -0500637 for (i = SKEL_ISO + 1; i < SKEL_ASYNC; ++i)
Jan Andersson51e2f622011-05-18 10:44:51 +0200638 uhci->skelqh[i]->link = LINK_TO_QH(uhci, uhci->skel_async_qh);
639 uhci->skel_async_qh->link = UHCI_PTR_TERM(uhci);
640 uhci->skel_term_qh->link = LINK_TO_QH(uhci, uhci->skel_term_qh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
642 /* This dummy TD is to work around a bug in Intel PIIX controllers */
Jan Andersson51e2f622011-05-18 10:44:51 +0200643 uhci_fill_td(uhci, uhci->term_td, 0, uhci_explen(0) |
Alan Stern17230ac2007-02-19 15:52:45 -0500644 (0x7f << TD_TOKEN_DEVADDR_SHIFT) | USB_PID_IN, 0);
Jan Andersson51e2f622011-05-18 10:44:51 +0200645 uhci->term_td->link = UHCI_PTR_TERM(uhci);
Alan Stern17230ac2007-02-19 15:52:45 -0500646 uhci->skel_async_qh->element = uhci->skel_term_qh->element =
Jan Andersson51e2f622011-05-18 10:44:51 +0200647 LINK_TO_TD(uhci, uhci->term_td);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
649 /*
650 * Fill the frame list: make all entries point to the proper
651 * interrupt queue.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 */
653 for (i = 0; i < UHCI_NUMFRAMES; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
655 /* Only place we don't use the frame list routines */
Alan Sternf3fe2392007-01-08 12:00:28 -0500656 uhci->frame[i] = uhci_frame_skel_link(uhci, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 }
658
659 /*
660 * Some architectures require a full mb() to enforce completion of
Alan Sterna8bed8b2005-04-09 17:29:00 -0400661 * the memory writes above before the I/O transfers in configure_hc().
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 */
663 mb();
Alan Sterna8bed8b2005-04-09 17:29:00 -0400664
665 configure_hc(uhci);
Alan Stern8d402e12005-12-17 18:03:37 -0500666 uhci->is_initialized = 1;
Alan Sternba297ed2010-06-09 17:34:39 -0400667 spin_lock_irq(&uhci->lock);
Alan Sterna8bed8b2005-04-09 17:29:00 -0400668 start_rh(uhci);
Alan Sternba297ed2010-06-09 17:34:39 -0400669 spin_unlock_irq(&uhci->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 return 0;
671
672/*
673 * error exits:
674 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675err_alloc_skelqh:
Alan Stern8b4cd422005-09-16 14:17:45 -0400676 for (i = 0; i < UHCI_NUM_SKELQH; i++) {
677 if (uhci->skelqh[i])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 uhci_free_qh(uhci, uhci->skelqh[i]);
Alan Stern8b4cd422005-09-16 14:17:45 -0400679 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
681 uhci_free_td(uhci, uhci->term_td);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682
683err_alloc_term_td:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 dma_pool_destroy(uhci->qh_pool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
686err_create_qh_pool:
687 dma_pool_destroy(uhci->td_pool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
689err_create_td_pool:
Alan Sterna1d59ce2005-09-16 14:22:51 -0400690 kfree(uhci->frame_cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Alan Sterna1d59ce2005-09-16 14:22:51 -0400692err_alloc_frame_cpu:
693 dma_free_coherent(uhci_dev(uhci),
694 UHCI_NUMFRAMES * sizeof(*uhci->frame),
695 uhci->frame, uhci->frame_dma_handle);
696
697err_alloc_frame:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 debugfs_remove(uhci->dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 return retval;
701}
702
703static void uhci_stop(struct usb_hcd *hcd)
704{
705 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
706
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 spin_lock_irq(&uhci->lock);
Alan Stern541c7d42010-06-22 16:39:10 -0400708 if (HCD_HW_ACCESSIBLE(hcd) && !uhci->dead)
Alan Sterne323de42006-06-05 12:21:30 -0400709 uhci_hc_died(uhci);
David Howells7d12e782006-10-05 14:55:46 +0100710 uhci_scan_schedule(uhci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 spin_unlock_irq(&uhci->lock);
Pete Zaitcevd23356da2010-01-08 15:39:22 -0700712 synchronize_irq(hcd->irq);
Alan Stern6c1b4452005-04-21 16:04:58 -0400713
Alan Sternc5e3b742006-06-05 12:28:57 -0400714 del_timer_sync(&uhci->fsbr_timer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 release_uhci(uhci);
716}
717
718#ifdef CONFIG_PM
Alan Sterna8bed8b2005-04-09 17:29:00 -0400719static int uhci_rh_suspend(struct usb_hcd *hcd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720{
721 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
David Brownellbe3cbc52006-06-05 12:16:39 -0400722 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
724 spin_lock_irq(&uhci->lock);
Alan Stern541c7d42010-06-22 16:39:10 -0400725 if (!HCD_HW_ACCESSIBLE(hcd))
David Brownellbe3cbc52006-06-05 12:16:39 -0400726 rc = -ESHUTDOWN;
Alan Sterncec3a532010-01-08 11:18:20 -0500727 else if (uhci->dead)
728 ; /* Dead controllers tell no tales */
729
730 /* Once the controller is stopped, port resumes that are already
731 * in progress won't complete. Hence if remote wakeup is enabled
732 * for the root hub and any ports are in the middle of a resume or
733 * remote wakeup, we must fail the suspend.
734 */
735 else if (hcd->self.root_hub->do_remote_wakeup &&
736 uhci->resuming_ports) {
737 dev_dbg(uhci_dev(uhci), "suspend failed because a port "
738 "is resuming\n");
739 rc = -EBUSY;
740 } else
Alan Stern4daaa872005-04-09 17:30:08 -0400741 suspend_rh(uhci, UHCI_RH_SUSPENDED);
Alan Sterna8bed8b2005-04-09 17:29:00 -0400742 spin_unlock_irq(&uhci->lock);
David Brownellbe3cbc52006-06-05 12:16:39 -0400743 return rc;
Alan Sterna8bed8b2005-04-09 17:29:00 -0400744}
745
746static int uhci_rh_resume(struct usb_hcd *hcd)
747{
748 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
Alan Stern4daaa872005-04-09 17:30:08 -0400749 int rc = 0;
Alan Sterna8bed8b2005-04-09 17:29:00 -0400750
751 spin_lock_irq(&uhci->lock);
Alan Stern541c7d42010-06-22 16:39:10 -0400752 if (!HCD_HW_ACCESSIBLE(hcd))
David Brownellbe3cbc52006-06-05 12:16:39 -0400753 rc = -ESHUTDOWN;
Alan Sterncfa59da2007-06-21 16:25:35 -0400754 else if (!uhci->dead)
Alan Stern4daaa872005-04-09 17:30:08 -0400755 wakeup_rh(uhci);
Alan Sterna8bed8b2005-04-09 17:29:00 -0400756 spin_unlock_irq(&uhci->lock);
Alan Stern4daaa872005-04-09 17:30:08 -0400757 return rc;
Alan Sterna8bed8b2005-04-09 17:29:00 -0400758}
759
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760#endif
761
Alan Sterndccf4a42005-12-17 17:58:46 -0500762/* Wait until a particular device/endpoint's QH is idle, and free it */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763static void uhci_hcd_endpoint_disable(struct usb_hcd *hcd,
Alan Sterndccf4a42005-12-17 17:58:46 -0500764 struct usb_host_endpoint *hep)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765{
766 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
Alan Sterndccf4a42005-12-17 17:58:46 -0500767 struct uhci_qh *qh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
Alan Sterndccf4a42005-12-17 17:58:46 -0500769 spin_lock_irq(&uhci->lock);
770 qh = (struct uhci_qh *) hep->hcpriv;
771 if (qh == NULL)
772 goto done;
773
774 while (qh->state != QH_STATE_IDLE) {
775 ++uhci->num_waiting;
776 spin_unlock_irq(&uhci->lock);
777 wait_event_interruptible(uhci->waitqh,
778 qh->state == QH_STATE_IDLE);
779 spin_lock_irq(&uhci->lock);
780 --uhci->num_waiting;
781 }
782
783 uhci_free_qh(uhci, qh);
784done:
785 spin_unlock_irq(&uhci->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786}
787
788static int uhci_hcd_get_frame_number(struct usb_hcd *hcd)
789{
790 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
Alan Sternc4334722006-05-19 16:34:57 -0400791 unsigned frame_number;
792 unsigned delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
794 /* Minimize latency by avoiding the spinlock */
Alan Sternc4334722006-05-19 16:34:57 -0400795 frame_number = uhci->frame_number;
796 barrier();
Jan Andersson9faa0912011-05-06 12:00:16 +0200797 delta = (uhci_readw(uhci, USBFRNUM) - frame_number) &
Alan Sternc4334722006-05-19 16:34:57 -0400798 (UHCI_NUMFRAMES - 1);
799 return frame_number + delta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800}
801
Jan Anderssonc31a65f2011-05-06 12:00:15 +0200802/* Determines number of ports on controller */
803static int uhci_count_ports(struct usb_hcd *hcd)
804{
805 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
806 unsigned io_size = (unsigned) hcd->rsrc_len;
807 int port;
808
809 /* The UHCI spec says devices must have 2 ports, and goes on to say
810 * they may have more but gives no way to determine how many there
811 * are. However according to the UHCI spec, Bit 7 of the port
812 * status and control register is always set to 1. So we try to
813 * use this to our advantage. Another common failure mode when
814 * a nonexistent register is addressed is to return all ones, so
815 * we test for that also.
816 */
817 for (port = 0; port < (io_size - USBPORTSC1) / 2; port++) {
818 unsigned int portstatus;
819
Jan Andersson9faa0912011-05-06 12:00:16 +0200820 portstatus = uhci_readw(uhci, USBPORTSC1 + (port * 2));
Jan Anderssonc31a65f2011-05-06 12:00:15 +0200821 if (!(portstatus & 0x0080) || portstatus == 0xffff)
822 break;
823 }
824 if (debug)
825 dev_info(uhci_dev(uhci), "detected %d ports\n", port);
826
827 /* Anything greater than 7 is weird so we'll ignore it. */
828 if (port > UHCI_RH_MAXCHILD) {
829 dev_info(uhci_dev(uhci), "port count misdetected? "
830 "forcing to 2 ports\n");
831 port = 2;
832 }
833
834 return port;
835}
836
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837static const char hcd_name[] = "uhci_hcd";
838
Jan Andersson3db77392011-05-06 12:00:18 +0200839#ifdef CONFIG_PCI
Jan Anderssonc31a65f2011-05-06 12:00:15 +0200840#include "uhci-pci.c"
Jan Andersson3db77392011-05-06 12:00:18 +0200841#define PCI_DRIVER uhci_pci_driver
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
Jan Andersson3db77392011-05-06 12:00:18 +0200844#ifdef CONFIG_SPARC_LEON
845#include "uhci-grlib.c"
846#define PLATFORM_DRIVER uhci_grlib_driver
Alan Sternabb30642009-04-27 13:33:24 -0400847#endif
Jan Andersson3db77392011-05-06 12:00:18 +0200848
849#if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER)
850#error "missing bus glue for uhci-hcd"
851#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853static int __init uhci_hcd_init(void)
854{
855 int retval = -ENOMEM;
856
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 if (usb_disabled())
858 return -ENODEV;
859
Alan Stern2b70f072008-10-02 11:47:15 -0400860 printk(KERN_INFO "uhci_hcd: " DRIVER_DESC "%s\n",
861 ignore_oc ? ", overcurrent ignored" : "");
Alan Stern9beeee62008-10-02 11:48:13 -0400862 set_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
Alan Stern2b70f072008-10-02 11:47:15 -0400863
Alan Stern8d402e12005-12-17 18:03:37 -0500864 if (DEBUG_CONFIGURED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 errbuf = kmalloc(ERRBUF_LEN, GFP_KERNEL);
866 if (!errbuf)
867 goto errbuf_failed;
Greg Kroah-Hartmanec20df22009-04-24 15:15:00 -0700868 uhci_debugfs_root = debugfs_create_dir("uhci", usb_debug_root);
Alan Stern8d402e12005-12-17 18:03:37 -0500869 if (!uhci_debugfs_root)
870 goto debug_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 }
872
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 uhci_up_cachep = kmem_cache_create("uhci_urb_priv",
Paul Mundt20c2df82007-07-20 10:11:58 +0900874 sizeof(struct urb_priv), 0, 0, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 if (!uhci_up_cachep)
876 goto up_failed;
877
Jan Andersson3db77392011-05-06 12:00:18 +0200878#ifdef PLATFORM_DRIVER
879 retval = platform_driver_register(&PLATFORM_DRIVER);
880 if (retval < 0)
881 goto clean0;
882#endif
883
884#ifdef PCI_DRIVER
885 retval = pci_register_driver(&PCI_DRIVER);
886 if (retval < 0)
887 goto clean1;
888#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
890 return 0;
891
Jan Andersson3db77392011-05-06 12:00:18 +0200892#ifdef PCI_DRIVER
893clean1:
894#endif
895#ifdef PLATFORM_DRIVER
896 platform_driver_unregister(&PLATFORM_DRIVER);
897clean0:
898#endif
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700899 kmem_cache_destroy(uhci_up_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900
901up_failed:
902 debugfs_remove(uhci_debugfs_root);
903
904debug_failed:
905 kfree(errbuf);
906
907errbuf_failed:
908
Alan Stern9beeee62008-10-02 11:48:13 -0400909 clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 return retval;
911}
912
913static void __exit uhci_hcd_cleanup(void)
914{
Jan Andersson3db77392011-05-06 12:00:18 +0200915#ifdef PLATFORM_DRIVER
916 platform_driver_unregister(&PLATFORM_DRIVER);
917#endif
918#ifdef PCI_DRIVER
919 pci_unregister_driver(&PCI_DRIVER);
920#endif
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700921 kmem_cache_destroy(uhci_up_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 debugfs_remove(uhci_debugfs_root);
Jesper Juhl1bc3c9e2005-04-18 17:39:34 -0700923 kfree(errbuf);
Alan Stern9beeee62008-10-02 11:48:13 -0400924 clear_bit(USB_UHCI_LOADED, &usb_hcds_loaded);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925}
926
927module_init(uhci_hcd_init);
928module_exit(uhci_hcd_cleanup);
929
930MODULE_AUTHOR(DRIVER_AUTHOR);
931MODULE_DESCRIPTION(DRIVER_DESC);
932MODULE_LICENSE("GPL");