1 /*
2 * UHCI HCD (Host Controller Driver) PCI Bus Glue.
3 *
4 * Extracted from uhci-hcd.c:
5 * Maintainer: Alan Stern <stern@rowland.harvard.edu>
6 *
7 * (C) Copyright 1999 Linus Torvalds
8 * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
9 * (C) Copyright 1999 Randy Dunlap
10 * (C) Copyright 1999 Georg Acher, acher@in.tum.de
11 * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
12 * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
13 * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
14 * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
15 * support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
16 * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
17 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
18 */
19
20 #include "pci-quirks.h"
21
22 /*
23 * Make sure the controller is completely inactive, unable to
24 * generate interrupts or do DMA.
25 */
uhci_pci_reset_hc(struct uhci_hcd * uhci)26 static void uhci_pci_reset_hc(struct uhci_hcd *uhci)
27 {
28 uhci_reset_hc(to_pci_dev(uhci_dev(uhci)), uhci->io_addr);
29 }
30
31 /*
32 * Initialize a controller that was newly discovered or has just been
33 * resumed. In either case we can't be sure of its previous state.
34 *
35 * Returns: 1 if the controller was reset, 0 otherwise.
36 */
uhci_pci_check_and_reset_hc(struct uhci_hcd * uhci)37 static int uhci_pci_check_and_reset_hc(struct uhci_hcd *uhci)
38 {
39 return uhci_check_and_reset_hc(to_pci_dev(uhci_dev(uhci)),
40 uhci->io_addr);
41 }
42
43 /*
44 * Store the basic register settings needed by the controller.
45 * This function is called at the end of configure_hc in uhci-hcd.c.
46 */
uhci_pci_configure_hc(struct uhci_hcd * uhci)47 static void uhci_pci_configure_hc(struct uhci_hcd *uhci)
48 {
49 struct pci_dev *pdev = to_pci_dev(uhci_dev(uhci));
50
51 /* Enable PIRQ */
52 pci_write_config_word(pdev, USBLEGSUP, USBLEGSUP_DEFAULT);
53
54 /* Disable platform-specific non-PME# wakeup */
55 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
56 pci_write_config_byte(pdev, USBRES_INTEL, 0);
57 }
58
uhci_pci_resume_detect_interrupts_are_broken(struct uhci_hcd * uhci)59 static int uhci_pci_resume_detect_interrupts_are_broken(struct uhci_hcd *uhci)
60 {
61 int port;
62
63 switch (to_pci_dev(uhci_dev(uhci))->vendor) {
64 default:
65 break;
66
67 case PCI_VENDOR_ID_GENESYS:
68 /* Genesys Logic's GL880S controllers don't generate
69 * resume-detect interrupts.
70 */
71 return 1;
72
73 case PCI_VENDOR_ID_INTEL:
74 /* Some of Intel's USB controllers have a bug that causes
75 * resume-detect interrupts if any port has an over-current
76 * condition. To make matters worse, some motherboards
77 * hardwire unused USB ports' over-current inputs active!
78 * To prevent problems, we will not enable resume-detect
79 * interrupts if any ports are OC.
80 */
81 for (port = 0; port < uhci->rh_numports; ++port) {
82 if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
83 USBPORTSC_OC)
84 return 1;
85 }
86 break;
87 }
88 return 0;
89 }
90
uhci_pci_global_suspend_mode_is_broken(struct uhci_hcd * uhci)91 static int uhci_pci_global_suspend_mode_is_broken(struct uhci_hcd *uhci)
92 {
93 int port;
94 const char *sys_info;
95 static const char bad_Asus_board[] = "A7V8X";
96
97 /* One of Asus's motherboards has a bug which causes it to
98 * wake up immediately from suspend-to-RAM if any of the ports
99 * are connected. In such cases we will not set EGSM.
100 */
101 sys_info = dmi_get_system_info(DMI_BOARD_NAME);
102 if (sys_info && !strcmp(sys_info, bad_Asus_board)) {
103 for (port = 0; port < uhci->rh_numports; ++port) {
104 if (inw(uhci->io_addr + USBPORTSC1 + port * 2) &
105 USBPORTSC_CCS)
106 return 1;
107 }
108 }
109
110 return 0;
111 }
112
uhci_pci_init(struct usb_hcd * hcd)113 static int uhci_pci_init(struct usb_hcd *hcd)
114 {
115 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
116
117 uhci->io_addr = (unsigned long) hcd->rsrc_start;
118
119 uhci->rh_numports = uhci_count_ports(hcd);
120
121 /* Intel controllers report the OverCurrent bit active on.
122 * VIA controllers report it active off, so we'll adjust the
123 * bit value. (It's not standardized in the UHCI spec.)
124 */
125 if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_VIA)
126 uhci->oc_low = 1;
127
128 /* HP's server management chip requires a longer port reset delay. */
129 if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_HP)
130 uhci->wait_for_hp = 1;
131
132 /* Set up pointers to PCI-specific functions */
133 uhci->reset_hc = uhci_pci_reset_hc;
134 uhci->check_and_reset_hc = uhci_pci_check_and_reset_hc;
135 uhci->configure_hc = uhci_pci_configure_hc;
136 uhci->resume_detect_interrupts_are_broken =
137 uhci_pci_resume_detect_interrupts_are_broken;
138 uhci->global_suspend_mode_is_broken =
139 uhci_pci_global_suspend_mode_is_broken;
140
141
142 /* Kick BIOS off this hardware and reset if the controller
143 * isn't already safely quiescent.
144 */
145 check_and_reset_hc(uhci);
146 return 0;
147 }
148
149 /* Make sure the controller is quiescent and that we're not using it
150 * any more. This is mainly for the benefit of programs which, like kexec,
151 * expect the hardware to be idle: not doing DMA or generating IRQs.
152 *
153 * This routine may be called in a damaged or failing kernel. Hence we
154 * do not acquire the spinlock before shutting down the controller.
155 */
uhci_shutdown(struct pci_dev * pdev)156 static void uhci_shutdown(struct pci_dev *pdev)
157 {
158 struct usb_hcd *hcd = pci_get_drvdata(pdev);
159
160 uhci_hc_died(hcd_to_uhci(hcd));
161 }
162
163 #ifdef CONFIG_PM
164
uhci_pci_suspend(struct usb_hcd * hcd,bool do_wakeup)165 static int uhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
166 {
167 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
168 struct pci_dev *pdev = to_pci_dev(uhci_dev(uhci));
169 int rc = 0;
170
171 dev_dbg(uhci_dev(uhci), "%s\n", __func__);
172
173 spin_lock_irq(&uhci->lock);
174 if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead)
175 goto done_okay; /* Already suspended or dead */
176
177 if (uhci->rh_state > UHCI_RH_SUSPENDED) {
178 dev_warn(uhci_dev(uhci), "Root hub isn't suspended!\n");
179 rc = -EBUSY;
180 goto done;
181 };
182
183 /* All PCI host controllers are required to disable IRQ generation
184 * at the source, so we must turn off PIRQ.
185 */
186 pci_write_config_word(pdev, USBLEGSUP, 0);
187 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
188
189 /* Enable platform-specific non-PME# wakeup */
190 if (do_wakeup) {
191 if (pdev->vendor == PCI_VENDOR_ID_INTEL)
192 pci_write_config_byte(pdev, USBRES_INTEL,
193 USBPORT1EN | USBPORT2EN);
194 }
195
196 done_okay:
197 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
198 done:
199 spin_unlock_irq(&uhci->lock);
200 return rc;
201 }
202
uhci_pci_resume(struct usb_hcd * hcd,bool hibernated)203 static int uhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
204 {
205 struct uhci_hcd *uhci = hcd_to_uhci(hcd);
206
207 dev_dbg(uhci_dev(uhci), "%s\n", __func__);
208
209 /* Since we aren't in D3 any more, it's safe to set this flag
210 * even if the controller was dead.
211 */
212 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
213
214 spin_lock_irq(&uhci->lock);
215
216 /* Make sure resume from hibernation re-enumerates everything */
217 if (hibernated) {
218 uhci->reset_hc(uhci);
219 finish_reset(uhci);
220 }
221
222 /* The firmware may have changed the controller settings during
223 * a system wakeup. Check it and reconfigure to avoid problems.
224 */
225 else {
226 check_and_reset_hc(uhci);
227 }
228 configure_hc(uhci);
229
230 /* Tell the core if the controller had to be reset */
231 if (uhci->rh_state == UHCI_RH_RESET)
232 usb_root_hub_lost_power(hcd->self.root_hub);
233
234 spin_unlock_irq(&uhci->lock);
235
236 /* If interrupts don't work and remote wakeup is enabled then
237 * the suspended root hub needs to be polled.
238 */
239 if (!uhci->RD_enable && hcd->self.root_hub->do_remote_wakeup)
240 set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
241
242 /* Does the root hub have a port wakeup pending? */
243 usb_hcd_poll_rh_status(hcd);
244 return 0;
245 }
246
247 #endif
248
249 static const struct hc_driver uhci_driver = {
250 .description = hcd_name,
251 .product_desc = "UHCI Host Controller",
252 .hcd_priv_size = sizeof(struct uhci_hcd),
253
254 /* Generic hardware linkage */
255 .irq = uhci_irq,
256 .flags = HCD_USB11,
257
258 /* Basic lifecycle operations */
259 .reset = uhci_pci_init,
260 .start = uhci_start,
261 #ifdef CONFIG_PM
262 .pci_suspend = uhci_pci_suspend,
263 .pci_resume = uhci_pci_resume,
264 .bus_suspend = uhci_rh_suspend,
265 .bus_resume = uhci_rh_resume,
266 #endif
267 .stop = uhci_stop,
268
269 .urb_enqueue = uhci_urb_enqueue,
270 .urb_dequeue = uhci_urb_dequeue,
271
272 .endpoint_disable = uhci_hcd_endpoint_disable,
273 .get_frame_number = uhci_hcd_get_frame_number,
274
275 .hub_status_data = uhci_hub_status_data,
276 .hub_control = uhci_hub_control,
277 };
278
279 static DEFINE_PCI_DEVICE_TABLE(uhci_pci_ids) = { {
280 /* handle any USB UHCI controller */
281 PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_UHCI, ~0),
282 .driver_data = (unsigned long) &uhci_driver,
283 }, { /* end: all zeroes */ }
284 };
285
286 MODULE_DEVICE_TABLE(pci, uhci_pci_ids);
287
288 static struct pci_driver uhci_pci_driver = {
289 .name = (char *)hcd_name,
290 .id_table = uhci_pci_ids,
291
292 .probe = usb_hcd_pci_probe,
293 .remove = usb_hcd_pci_remove,
294 .shutdown = uhci_shutdown,
295
296 #ifdef CONFIG_PM_SLEEP
297 .driver = {
298 .pm = &usb_hcd_pci_pm_ops
299 },
300 #endif
301 };
302