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 /* 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 */ 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 164 165 static int uhci_pci_resume(struct usb_hcd *hcd, bool hibernated); 166 167 static int uhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup) 168 { 169 struct uhci_hcd *uhci = hcd_to_uhci(hcd); 170 struct pci_dev *pdev = to_pci_dev(uhci_dev(uhci)); 171 int rc = 0; 172 173 dev_dbg(uhci_dev(uhci), "%s\n", __func__); 174 175 spin_lock_irq(&uhci->lock); 176 if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead) 177 goto done_okay; /* Already suspended or dead */ 178 179 /* All PCI host controllers are required to disable IRQ generation 180 * at the source, so we must turn off PIRQ. 181 */ 182 pci_write_config_word(pdev, USBLEGSUP, 0); 183 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); 184 185 /* Enable platform-specific non-PME# wakeup */ 186 if (do_wakeup) { 187 if (pdev->vendor == PCI_VENDOR_ID_INTEL) 188 pci_write_config_byte(pdev, USBRES_INTEL, 189 USBPORT1EN | USBPORT2EN); 190 } 191 192 done_okay: 193 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 194 spin_unlock_irq(&uhci->lock); 195 196 synchronize_irq(hcd->irq); 197 198 /* Check for race with a wakeup request */ 199 if (do_wakeup && HCD_WAKEUP_PENDING(hcd)) { 200 uhci_pci_resume(hcd, false); 201 rc = -EBUSY; 202 } 203 return rc; 204 } 205 206 static int uhci_pci_resume(struct usb_hcd *hcd, bool hibernated) 207 { 208 struct uhci_hcd *uhci = hcd_to_uhci(hcd); 209 210 dev_dbg(uhci_dev(uhci), "%s\n", __func__); 211 212 /* Since we aren't in D3 any more, it's safe to set this flag 213 * even if the controller was dead. 214 */ 215 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 216 217 spin_lock_irq(&uhci->lock); 218 219 /* Make sure resume from hibernation re-enumerates everything */ 220 if (hibernated) { 221 uhci->reset_hc(uhci); 222 finish_reset(uhci); 223 } 224 225 /* The firmware may have changed the controller settings during 226 * a system wakeup. Check it and reconfigure to avoid problems. 227 */ 228 else { 229 check_and_reset_hc(uhci); 230 } 231 configure_hc(uhci); 232 233 /* Tell the core if the controller had to be reset */ 234 if (uhci->rh_state == UHCI_RH_RESET) 235 usb_root_hub_lost_power(hcd->self.root_hub); 236 237 spin_unlock_irq(&uhci->lock); 238 239 /* If interrupts don't work and remote wakeup is enabled then 240 * the suspended root hub needs to be polled. 241 */ 242 if (!uhci->RD_enable && hcd->self.root_hub->do_remote_wakeup) 243 set_bit(HCD_FLAG_POLL_RH, &hcd->flags); 244 245 /* Does the root hub have a port wakeup pending? */ 246 usb_hcd_poll_rh_status(hcd); 247 return 0; 248 } 249 250 #endif 251 252 static const struct hc_driver uhci_driver = { 253 .description = hcd_name, 254 .product_desc = "UHCI Host Controller", 255 .hcd_priv_size = sizeof(struct uhci_hcd), 256 257 /* Generic hardware linkage */ 258 .irq = uhci_irq, 259 .flags = HCD_USB11, 260 261 /* Basic lifecycle operations */ 262 .reset = uhci_pci_init, 263 .start = uhci_start, 264 #ifdef CONFIG_PM 265 .pci_suspend = uhci_pci_suspend, 266 .pci_resume = uhci_pci_resume, 267 .bus_suspend = uhci_rh_suspend, 268 .bus_resume = uhci_rh_resume, 269 #endif 270 .stop = uhci_stop, 271 272 .urb_enqueue = uhci_urb_enqueue, 273 .urb_dequeue = uhci_urb_dequeue, 274 275 .endpoint_disable = uhci_hcd_endpoint_disable, 276 .get_frame_number = uhci_hcd_get_frame_number, 277 278 .hub_status_data = uhci_hub_status_data, 279 .hub_control = uhci_hub_control, 280 }; 281 282 static DEFINE_PCI_DEVICE_TABLE(uhci_pci_ids) = { { 283 /* handle any USB UHCI controller */ 284 PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_UHCI, ~0), 285 .driver_data = (unsigned long) &uhci_driver, 286 }, { /* end: all zeroes */ } 287 }; 288 289 MODULE_DEVICE_TABLE(pci, uhci_pci_ids); 290 291 static struct pci_driver uhci_pci_driver = { 292 .name = (char *)hcd_name, 293 .id_table = uhci_pci_ids, 294 295 .probe = usb_hcd_pci_probe, 296 .remove = usb_hcd_pci_remove, 297 .shutdown = uhci_shutdown, 298 299 #ifdef CONFIG_PM 300 .driver = { 301 .pm = &usb_hcd_pci_pm_ops 302 }, 303 #endif 304 }; 305 306 MODULE_SOFTDEP("pre: ehci_pci"); 307