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 */ 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 */ 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 */ 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 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 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 } 112 113 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 /* Intel controllers use non-PME wakeup signalling */ 133 if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_INTEL) 134 device_set_wakeup_capable(uhci_dev(uhci), true); 135 136 /* Set up pointers to PCI-specific functions */ 137 uhci->reset_hc = uhci_pci_reset_hc; 138 uhci->check_and_reset_hc = uhci_pci_check_and_reset_hc; 139 uhci->configure_hc = uhci_pci_configure_hc; 140 uhci->resume_detect_interrupts_are_broken = 141 uhci_pci_resume_detect_interrupts_are_broken; 142 uhci->global_suspend_mode_is_broken = 143 uhci_pci_global_suspend_mode_is_broken; 144 145 146 /* Kick BIOS off this hardware and reset if the controller 147 * isn't already safely quiescent. 148 */ 149 check_and_reset_hc(uhci); 150 return 0; 151 } 152 153 /* Make sure the controller is quiescent and that we're not using it 154 * any more. This is mainly for the benefit of programs which, like kexec, 155 * expect the hardware to be idle: not doing DMA or generating IRQs. 156 * 157 * This routine may be called in a damaged or failing kernel. Hence we 158 * do not acquire the spinlock before shutting down the controller. 159 */ 160 static void uhci_shutdown(struct pci_dev *pdev) 161 { 162 struct usb_hcd *hcd = pci_get_drvdata(pdev); 163 164 uhci_hc_died(hcd_to_uhci(hcd)); 165 } 166 167 #ifdef CONFIG_PM 168 169 static int uhci_pci_resume(struct usb_hcd *hcd, bool hibernated); 170 171 static int uhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup) 172 { 173 struct uhci_hcd *uhci = hcd_to_uhci(hcd); 174 struct pci_dev *pdev = to_pci_dev(uhci_dev(uhci)); 175 int rc = 0; 176 177 dev_dbg(uhci_dev(uhci), "%s\n", __func__); 178 179 spin_lock_irq(&uhci->lock); 180 if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead) 181 goto done_okay; /* Already suspended or dead */ 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 spin_unlock_irq(&uhci->lock); 199 200 synchronize_irq(hcd->irq); 201 202 /* Check for race with a wakeup request */ 203 if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) { 204 uhci_pci_resume(hcd, false); 205 rc = -EBUSY; 206 } 207 return rc; 208 } 209 210 static int uhci_pci_resume(struct usb_hcd *hcd, bool hibernated) 211 { 212 struct uhci_hcd *uhci = hcd_to_uhci(hcd); 213 214 dev_dbg(uhci_dev(uhci), "%s\n", __func__); 215 216 /* Since we aren't in D3 any more, it's safe to set this flag 217 * even if the controller was dead. 218 */ 219 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 220 221 spin_lock_irq(&uhci->lock); 222 223 /* Make sure resume from hibernation re-enumerates everything */ 224 if (hibernated) { 225 uhci->reset_hc(uhci); 226 finish_reset(uhci); 227 } 228 229 /* The firmware may have changed the controller settings during 230 * a system wakeup. Check it and reconfigure to avoid problems. 231 */ 232 else { 233 check_and_reset_hc(uhci); 234 } 235 configure_hc(uhci); 236 237 /* Tell the core if the controller had to be reset */ 238 if (uhci->rh_state == UHCI_RH_RESET) 239 usb_root_hub_lost_power(hcd->self.root_hub); 240 241 spin_unlock_irq(&uhci->lock); 242 243 /* If interrupts don't work and remote wakeup is enabled then 244 * the suspended root hub needs to be polled. 245 */ 246 if (!uhci->RD_enable && hcd->self.root_hub->do_remote_wakeup) 247 set_bit(HCD_FLAG_POLL_RH, &hcd->flags); 248 249 /* Does the root hub have a port wakeup pending? */ 250 usb_hcd_poll_rh_status(hcd); 251 return 0; 252 } 253 254 #endif 255 256 static const struct hc_driver uhci_driver = { 257 .description = hcd_name, 258 .product_desc = "UHCI Host Controller", 259 .hcd_priv_size = sizeof(struct uhci_hcd), 260 261 /* Generic hardware linkage */ 262 .irq = uhci_irq, 263 .flags = HCD_USB11, 264 265 /* Basic lifecycle operations */ 266 .reset = uhci_pci_init, 267 .start = uhci_start, 268 #ifdef CONFIG_PM 269 .pci_suspend = uhci_pci_suspend, 270 .pci_resume = uhci_pci_resume, 271 .bus_suspend = uhci_rh_suspend, 272 .bus_resume = uhci_rh_resume, 273 #endif 274 .stop = uhci_stop, 275 276 .urb_enqueue = uhci_urb_enqueue, 277 .urb_dequeue = uhci_urb_dequeue, 278 279 .endpoint_disable = uhci_hcd_endpoint_disable, 280 .get_frame_number = uhci_hcd_get_frame_number, 281 282 .hub_status_data = uhci_hub_status_data, 283 .hub_control = uhci_hub_control, 284 }; 285 286 static const struct pci_device_id uhci_pci_ids[] = { { 287 /* handle any USB UHCI controller */ 288 PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_UHCI, ~0), 289 .driver_data = (unsigned long) &uhci_driver, 290 }, { /* end: all zeroes */ } 291 }; 292 293 MODULE_DEVICE_TABLE(pci, uhci_pci_ids); 294 295 static struct pci_driver uhci_pci_driver = { 296 .name = (char *)hcd_name, 297 .id_table = uhci_pci_ids, 298 299 .probe = usb_hcd_pci_probe, 300 .remove = usb_hcd_pci_remove, 301 .shutdown = uhci_shutdown, 302 303 #ifdef CONFIG_PM 304 .driver = { 305 .pm = &usb_hcd_pci_pm_ops 306 }, 307 #endif 308 }; 309 310 MODULE_SOFTDEP("pre: ehci_pci"); 311