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0001 // SPDX-License-Identifier: GPL-1.0+
0002 /*
0003  * OHCI HCD (Host Controller Driver) for USB.
0004  *
0005  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
0006  * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
0007  *
0008  * This file is licenced under GPL
0009  */
0010 
0011 /*-------------------------------------------------------------------------*/
0012 
0013 /*
0014  * OHCI Root Hub ... the nonsharable stuff
0015  */
0016 
0017 #define dbg_port(hc,label,num,value) \
0018     ohci_dbg (hc, \
0019         "%s roothub.portstatus [%d] " \
0020         "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
0021         label, num, value, \
0022         (value & RH_PS_PRSC) ? " PRSC" : "", \
0023         (value & RH_PS_OCIC) ? " OCIC" : "", \
0024         (value & RH_PS_PSSC) ? " PSSC" : "", \
0025         (value & RH_PS_PESC) ? " PESC" : "", \
0026         (value & RH_PS_CSC) ? " CSC" : "", \
0027         \
0028         (value & RH_PS_LSDA) ? " LSDA" : "", \
0029         (value & RH_PS_PPS) ? " PPS" : "", \
0030         (value & RH_PS_PRS) ? " PRS" : "", \
0031         (value & RH_PS_POCI) ? " POCI" : "", \
0032         (value & RH_PS_PSS) ? " PSS" : "", \
0033         \
0034         (value & RH_PS_PES) ? " PES" : "", \
0035         (value & RH_PS_CCS) ? " CCS" : "" \
0036         );
0037 
0038 /*-------------------------------------------------------------------------*/
0039 
0040 #define OHCI_SCHED_ENABLES \
0041     (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
0042 
0043 static void update_done_list(struct ohci_hcd *);
0044 static void ohci_work(struct ohci_hcd *);
0045 
0046 #ifdef  CONFIG_PM
0047 static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
0048 __releases(ohci->lock)
0049 __acquires(ohci->lock)
0050 {
0051     int         status = 0;
0052 
0053     ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
0054     switch (ohci->hc_control & OHCI_CTRL_HCFS) {
0055     case OHCI_USB_RESUME:
0056         ohci_dbg (ohci, "resume/suspend?\n");
0057         ohci->hc_control &= ~OHCI_CTRL_HCFS;
0058         ohci->hc_control |= OHCI_USB_RESET;
0059         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
0060         (void) ohci_readl (ohci, &ohci->regs->control);
0061         fallthrough;
0062     case OHCI_USB_RESET:
0063         status = -EBUSY;
0064         ohci_dbg (ohci, "needs reinit!\n");
0065         goto done;
0066     case OHCI_USB_SUSPEND:
0067         if (!ohci->autostop) {
0068             ohci_dbg (ohci, "already suspended\n");
0069             goto done;
0070         }
0071     }
0072     ohci_dbg (ohci, "%s root hub\n",
0073             autostop ? "auto-stop" : "suspend");
0074 
0075     /* First stop any processing */
0076     if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
0077         ohci->hc_control &= ~OHCI_SCHED_ENABLES;
0078         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
0079         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
0080         ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
0081 
0082         /* sched disables take effect on the next frame,
0083          * then the last WDH could take 6+ msec
0084          */
0085         ohci_dbg (ohci, "stopping schedules ...\n");
0086         ohci->autostop = 0;
0087         spin_unlock_irq (&ohci->lock);
0088         msleep (8);
0089         spin_lock_irq (&ohci->lock);
0090     }
0091     update_done_list(ohci);
0092     ohci_work(ohci);
0093 
0094     /* All ED unlinks should be finished, no need for SOF interrupts */
0095     ohci_writel(ohci, OHCI_INTR_SF, &ohci->regs->intrdisable);
0096 
0097     /*
0098      * Some controllers don't handle "global" suspend properly if
0099      * there are unsuspended ports.  For these controllers, put all
0100      * the enabled ports into suspend before suspending the root hub.
0101      */
0102     if (ohci->flags & OHCI_QUIRK_GLOBAL_SUSPEND) {
0103         __hc32 __iomem  *portstat = ohci->regs->roothub.portstatus;
0104         int     i;
0105         unsigned    temp;
0106 
0107         for (i = 0; i < ohci->num_ports; (++i, ++portstat)) {
0108             temp = ohci_readl(ohci, portstat);
0109             if ((temp & (RH_PS_PES | RH_PS_PSS)) ==
0110                     RH_PS_PES)
0111                 ohci_writel(ohci, RH_PS_PSS, portstat);
0112         }
0113     }
0114 
0115     /* maybe resume can wake root hub */
0116     if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
0117         ohci->hc_control |= OHCI_CTRL_RWE;
0118     } else {
0119         ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
0120                 &ohci->regs->intrdisable);
0121         ohci->hc_control &= ~OHCI_CTRL_RWE;
0122     }
0123 
0124     /* Suspend hub ... this is the "global (to this bus) suspend" mode,
0125      * which doesn't imply ports will first be individually suspended.
0126      */
0127     ohci->hc_control &= ~OHCI_CTRL_HCFS;
0128     ohci->hc_control |= OHCI_USB_SUSPEND;
0129     ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
0130     (void) ohci_readl (ohci, &ohci->regs->control);
0131 
0132     /* no resumes until devices finish suspending */
0133     if (!autostop) {
0134         ohci->next_statechange = jiffies + msecs_to_jiffies (5);
0135         ohci->autostop = 0;
0136         ohci->rh_state = OHCI_RH_SUSPENDED;
0137     }
0138 
0139 done:
0140     return status;
0141 }
0142 
0143 static inline struct ed *find_head (struct ed *ed)
0144 {
0145     /* for bulk and control lists */
0146     while (ed->ed_prev)
0147         ed = ed->ed_prev;
0148     return ed;
0149 }
0150 
0151 /* caller has locked the root hub */
0152 static int ohci_rh_resume (struct ohci_hcd *ohci)
0153 __releases(ohci->lock)
0154 __acquires(ohci->lock)
0155 {
0156     struct usb_hcd      *hcd = ohci_to_hcd (ohci);
0157     u32         temp, enables;
0158     int         status = -EINPROGRESS;
0159     int         autostopped = ohci->autostop;
0160 
0161     ohci->autostop = 0;
0162     ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
0163 
0164     if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
0165         /* this can happen after resuming a swsusp snapshot */
0166         if (ohci->rh_state != OHCI_RH_RUNNING) {
0167             ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
0168                     ohci->hc_control);
0169             status = -EBUSY;
0170         /* this happens when pmcore resumes HC then root */
0171         } else {
0172             ohci_dbg (ohci, "duplicate resume\n");
0173             status = 0;
0174         }
0175     } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
0176     case OHCI_USB_SUSPEND:
0177         ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
0178         ohci->hc_control |= OHCI_USB_RESUME;
0179         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
0180         (void) ohci_readl (ohci, &ohci->regs->control);
0181         ohci_dbg (ohci, "%s root hub\n",
0182                 autostopped ? "auto-start" : "resume");
0183         break;
0184     case OHCI_USB_RESUME:
0185         /* HCFS changes sometime after INTR_RD */
0186         ohci_dbg(ohci, "%swakeup root hub\n",
0187                 autostopped ? "auto-" : "");
0188         break;
0189     case OHCI_USB_OPER:
0190         /* this can happen after resuming a swsusp snapshot */
0191         ohci_dbg (ohci, "snapshot resume? reinit\n");
0192         status = -EBUSY;
0193         break;
0194     default:        /* RESET, we lost power */
0195         ohci_dbg (ohci, "lost power\n");
0196         status = -EBUSY;
0197     }
0198     if (status == -EBUSY) {
0199         if (!autostopped) {
0200             spin_unlock_irq (&ohci->lock);
0201             status = ohci_restart (ohci);
0202 
0203             usb_root_hub_lost_power(hcd->self.root_hub);
0204 
0205             spin_lock_irq (&ohci->lock);
0206         }
0207         return status;
0208     }
0209     if (status != -EINPROGRESS)
0210         return status;
0211     if (autostopped)
0212         goto skip_resume;
0213     spin_unlock_irq (&ohci->lock);
0214 
0215     /* Some controllers (lucent erratum) need extra-long delays */
0216     msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
0217 
0218     temp = ohci_readl (ohci, &ohci->regs->control);
0219     temp &= OHCI_CTRL_HCFS;
0220     if (temp != OHCI_USB_RESUME) {
0221         ohci_err (ohci, "controller won't resume\n");
0222         spin_lock_irq(&ohci->lock);
0223         return -EBUSY;
0224     }
0225 
0226     /* disable old schedule state, reinit from scratch */
0227     ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
0228     ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
0229     ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
0230     ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
0231     ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
0232     ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
0233 
0234     /* Sometimes PCI D3 suspend trashes frame timings ... */
0235     periodic_reinit (ohci);
0236 
0237     /*
0238      * The following code is executed with ohci->lock held and
0239      * irqs disabled if and only if autostopped is true.  This
0240      * will cause sparse to warn about a "context imbalance".
0241      */
0242 skip_resume:
0243     /* interrupts might have been disabled */
0244     ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
0245     if (ohci->ed_rm_list)
0246         ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
0247 
0248     /* Then re-enable operations */
0249     ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
0250     (void) ohci_readl (ohci, &ohci->regs->control);
0251     if (!autostopped)
0252         msleep (3);
0253 
0254     temp = ohci->hc_control;
0255     temp &= OHCI_CTRL_RWC;
0256     temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
0257     ohci->hc_control = temp;
0258     ohci_writel (ohci, temp, &ohci->regs->control);
0259     (void) ohci_readl (ohci, &ohci->regs->control);
0260 
0261     /* TRSMRCY */
0262     if (!autostopped) {
0263         msleep (10);
0264         spin_lock_irq (&ohci->lock);
0265     }
0266     /* now ohci->lock is always held and irqs are always disabled */
0267 
0268     /* keep it alive for more than ~5x suspend + resume costs */
0269     ohci->next_statechange = jiffies + STATECHANGE_DELAY;
0270 
0271     /* maybe turn schedules back on */
0272     enables = 0;
0273     temp = 0;
0274     if (!ohci->ed_rm_list) {
0275         if (ohci->ed_controltail) {
0276             ohci_writel (ohci,
0277                     find_head (ohci->ed_controltail)->dma,
0278                     &ohci->regs->ed_controlhead);
0279             enables |= OHCI_CTRL_CLE;
0280             temp |= OHCI_CLF;
0281         }
0282         if (ohci->ed_bulktail) {
0283             ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
0284                 &ohci->regs->ed_bulkhead);
0285             enables |= OHCI_CTRL_BLE;
0286             temp |= OHCI_BLF;
0287         }
0288     }
0289     if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
0290         enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
0291     if (enables) {
0292         ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
0293         ohci->hc_control |= enables;
0294         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
0295         if (temp)
0296             ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
0297         (void) ohci_readl (ohci, &ohci->regs->control);
0298     }
0299 
0300     ohci->rh_state = OHCI_RH_RUNNING;
0301     return 0;
0302 }
0303 
0304 static int ohci_bus_suspend (struct usb_hcd *hcd)
0305 {
0306     struct ohci_hcd     *ohci = hcd_to_ohci (hcd);
0307     int         rc;
0308 
0309     spin_lock_irq (&ohci->lock);
0310 
0311     if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
0312         rc = -ESHUTDOWN;
0313     else
0314         rc = ohci_rh_suspend (ohci, 0);
0315     spin_unlock_irq (&ohci->lock);
0316 
0317     if (rc == 0) {
0318         del_timer_sync(&ohci->io_watchdog);
0319         ohci->prev_frame_no = IO_WATCHDOG_OFF;
0320     }
0321     return rc;
0322 }
0323 
0324 static int ohci_bus_resume (struct usb_hcd *hcd)
0325 {
0326     struct ohci_hcd     *ohci = hcd_to_ohci (hcd);
0327     int         rc;
0328 
0329     if (time_before (jiffies, ohci->next_statechange))
0330         msleep(5);
0331 
0332     spin_lock_irq (&ohci->lock);
0333 
0334     if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
0335         rc = -ESHUTDOWN;
0336     else
0337         rc = ohci_rh_resume (ohci);
0338     spin_unlock_irq (&ohci->lock);
0339 
0340     /* poll until we know a device is connected or we autostop */
0341     if (rc == 0)
0342         usb_hcd_poll_rh_status(hcd);
0343     return rc;
0344 }
0345 
0346 /* Carry out polling-, autostop-, and autoresume-related state changes */
0347 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
0348         int any_connected, int rhsc_status)
0349 {
0350     int poll_rh = 1;
0351     int rhsc_enable;
0352 
0353     /* Some broken controllers never turn off RHSC in the interrupt
0354      * status register.  For their sake we won't re-enable RHSC
0355      * interrupts if the interrupt bit is already active.
0356      */
0357     rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
0358             OHCI_INTR_RHSC;
0359 
0360     switch (ohci->hc_control & OHCI_CTRL_HCFS) {
0361     case OHCI_USB_OPER:
0362         /* If no status changes are pending, enable RHSC interrupts. */
0363         if (!rhsc_enable && !rhsc_status && !changed) {
0364             rhsc_enable = OHCI_INTR_RHSC;
0365             ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
0366         }
0367 
0368         /* Keep on polling until we know a device is connected
0369          * and RHSC is enabled, or until we autostop.
0370          */
0371         if (!ohci->autostop) {
0372             if (any_connected ||
0373                     !device_may_wakeup(&ohci_to_hcd(ohci)
0374                         ->self.root_hub->dev)) {
0375                 if (rhsc_enable)
0376                     poll_rh = 0;
0377             } else {
0378                 ohci->autostop = 1;
0379                 ohci->next_statechange = jiffies + HZ;
0380             }
0381 
0382         /* if no devices have been attached for one second, autostop */
0383         } else {
0384             if (changed || any_connected) {
0385                 ohci->autostop = 0;
0386                 ohci->next_statechange = jiffies +
0387                         STATECHANGE_DELAY;
0388             } else if (time_after_eq(jiffies,
0389                         ohci->next_statechange)
0390                     && !ohci->ed_rm_list
0391                     && !(ohci->hc_control &
0392                         OHCI_SCHED_ENABLES)) {
0393                 ohci_rh_suspend(ohci, 1);
0394                 if (rhsc_enable)
0395                     poll_rh = 0;
0396             }
0397         }
0398         break;
0399 
0400     case OHCI_USB_SUSPEND:
0401     case OHCI_USB_RESUME:
0402         /* if there is a port change, autostart or ask to be resumed */
0403         if (changed) {
0404             if (ohci->autostop)
0405                 ohci_rh_resume(ohci);
0406             else
0407                 usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
0408 
0409         /* If remote wakeup is disabled, stop polling */
0410         } else if (!ohci->autostop &&
0411                 !ohci_to_hcd(ohci)->self.root_hub->
0412                     do_remote_wakeup) {
0413             poll_rh = 0;
0414 
0415         } else {
0416             /* If no status changes are pending,
0417              * enable RHSC interrupts
0418              */
0419             if (!rhsc_enable && !rhsc_status) {
0420                 rhsc_enable = OHCI_INTR_RHSC;
0421                 ohci_writel(ohci, rhsc_enable,
0422                         &ohci->regs->intrenable);
0423             }
0424             /* Keep polling until RHSC is enabled */
0425             if (rhsc_enable)
0426                 poll_rh = 0;
0427         }
0428         break;
0429     }
0430     return poll_rh;
0431 }
0432 
0433 #else   /* CONFIG_PM */
0434 
0435 static inline int ohci_rh_resume(struct ohci_hcd *ohci)
0436 {
0437     return 0;
0438 }
0439 
0440 /* Carry out polling-related state changes.
0441  * autostop isn't used when CONFIG_PM is turned off.
0442  */
0443 static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
0444         int any_connected, int rhsc_status)
0445 {
0446     /* If RHSC is enabled, don't poll */
0447     if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
0448         return 0;
0449 
0450     /* If status changes are pending, continue polling.
0451      * Conversely, if no status changes are pending but the RHSC
0452      * status bit was set, then RHSC may be broken so continue polling.
0453      */
0454     if (changed || rhsc_status)
0455         return 1;
0456 
0457     /* It's safe to re-enable RHSC interrupts */
0458     ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
0459     return 0;
0460 }
0461 
0462 #endif  /* CONFIG_PM */
0463 
0464 /*-------------------------------------------------------------------------*/
0465 
0466 /* build "status change" packet (one or two bytes) from HC registers */
0467 
0468 int ohci_hub_status_data(struct usb_hcd *hcd, char *buf)
0469 {
0470     struct ohci_hcd *ohci = hcd_to_ohci (hcd);
0471     int     i, changed = 0, length = 1;
0472     int     any_connected = 0;
0473     int     rhsc_status;
0474     unsigned long   flags;
0475 
0476     spin_lock_irqsave (&ohci->lock, flags);
0477     if (!HCD_HW_ACCESSIBLE(hcd))
0478         goto done;
0479 
0480     /* undocumented erratum seen on at least rev D */
0481     if ((ohci->flags & OHCI_QUIRK_AMD756)
0482             && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
0483         ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
0484               ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
0485         /* retry later; "should not happen" */
0486         goto done;
0487     }
0488 
0489     /* init status */
0490     if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
0491         buf [0] = changed = 1;
0492     else
0493         buf [0] = 0;
0494     if (ohci->num_ports > 7) {
0495         buf [1] = 0;
0496         length++;
0497     }
0498 
0499     /* Clear the RHSC status flag before reading the port statuses */
0500     ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
0501     rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
0502             OHCI_INTR_RHSC;
0503 
0504     /* look at each port */
0505     for (i = 0; i < ohci->num_ports; i++) {
0506         u32 status = roothub_portstatus (ohci, i);
0507 
0508         /* can't autostop if ports are connected */
0509         any_connected |= (status & RH_PS_CCS);
0510 
0511         if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
0512                 | RH_PS_OCIC | RH_PS_PRSC)) {
0513             changed = 1;
0514             if (i < 7)
0515                 buf [0] |= 1 << (i + 1);
0516             else
0517                 buf [1] |= 1 << (i - 7);
0518         }
0519     }
0520 
0521     if (ohci_root_hub_state_changes(ohci, changed,
0522             any_connected, rhsc_status))
0523         set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
0524     else
0525         clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
0526 
0527 
0528 done:
0529     spin_unlock_irqrestore (&ohci->lock, flags);
0530 
0531     return changed ? length : 0;
0532 }
0533 EXPORT_SYMBOL_GPL(ohci_hub_status_data);
0534 
0535 /*-------------------------------------------------------------------------*/
0536 
0537 static void
0538 ohci_hub_descriptor (
0539     struct ohci_hcd         *ohci,
0540     struct usb_hub_descriptor   *desc
0541 ) {
0542     u32     rh = roothub_a (ohci);
0543     u16     temp;
0544 
0545     desc->bDescriptorType = USB_DT_HUB;
0546     desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
0547     desc->bHubContrCurrent = 0;
0548 
0549     desc->bNbrPorts = ohci->num_ports;
0550     temp = 1 + (ohci->num_ports / 8);
0551     desc->bDescLength = 7 + 2 * temp;
0552 
0553     temp = HUB_CHAR_COMMON_LPSM | HUB_CHAR_COMMON_OCPM;
0554     if (rh & RH_A_NPS)      /* no power switching? */
0555         temp |= HUB_CHAR_NO_LPSM;
0556     if (rh & RH_A_PSM)      /* per-port power switching? */
0557         temp |= HUB_CHAR_INDV_PORT_LPSM;
0558     if (rh & RH_A_NOCP)     /* no overcurrent reporting? */
0559         temp |= HUB_CHAR_NO_OCPM;
0560     else if (rh & RH_A_OCPM)    /* per-port overcurrent reporting? */
0561         temp |= HUB_CHAR_INDV_PORT_OCPM;
0562     desc->wHubCharacteristics = cpu_to_le16(temp);
0563 
0564     /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
0565     rh = roothub_b (ohci);
0566     memset(desc->u.hs.DeviceRemovable, 0xff,
0567             sizeof(desc->u.hs.DeviceRemovable));
0568     desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
0569     if (ohci->num_ports > 7) {
0570         desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
0571         desc->u.hs.DeviceRemovable[2] = 0xff;
0572     } else
0573         desc->u.hs.DeviceRemovable[1] = 0xff;
0574 }
0575 
0576 /*-------------------------------------------------------------------------*/
0577 
0578 #ifdef  CONFIG_USB_OTG
0579 
0580 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
0581 {
0582     struct ohci_hcd *ohci = hcd_to_ohci (hcd);
0583     u32         status;
0584 
0585     if (!port)
0586         return -EINVAL;
0587     port--;
0588 
0589     /* start port reset before HNP protocol times out */
0590     status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
0591     if (!(status & RH_PS_CCS))
0592         return -ENODEV;
0593 
0594     /* hub_wq will finish the reset later */
0595     ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
0596     return 0;
0597 }
0598 
0599 #else
0600 
0601 #define ohci_start_port_reset       NULL
0602 
0603 #endif
0604 
0605 /*-------------------------------------------------------------------------*/
0606 
0607 
0608 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
0609  * not necessarily continuous ... to guard against resume signaling.
0610  */
0611 #define PORT_RESET_MSEC     50
0612 
0613 /* this timer value might be vendor-specific ... */
0614 #define PORT_RESET_HW_MSEC  10
0615 
0616 /* wrap-aware logic morphed from <linux/jiffies.h> */
0617 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
0618 
0619 /* called from some task, normally hub_wq */
0620 static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
0621 {
0622     __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
0623     u32 temp = 0;
0624     u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
0625     u16 reset_done = now + PORT_RESET_MSEC;
0626     int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
0627 
0628     /* build a "continuous enough" reset signal, with up to
0629      * 3msec gap between pulses.  scheduler HZ==100 must work;
0630      * this might need to be deadline-scheduled.
0631      */
0632     do {
0633         int limit_2;
0634 
0635         /* spin until any current reset finishes */
0636         limit_2 = PORT_RESET_HW_MSEC * 2;
0637         while (--limit_2 >= 0) {
0638             temp = ohci_readl (ohci, portstat);
0639             /* handle e.g. CardBus eject */
0640             if (temp == ~(u32)0)
0641                 return -ESHUTDOWN;
0642             if (!(temp & RH_PS_PRS))
0643                 break;
0644             udelay (500);
0645         }
0646 
0647         /* timeout (a hardware error) has been observed when
0648          * EHCI sets CF while this driver is resetting a port;
0649          * presumably other disconnect paths might do it too.
0650          */
0651         if (limit_2 < 0) {
0652             ohci_dbg(ohci,
0653                 "port[%d] reset timeout, stat %08x\n",
0654                 port, temp);
0655             break;
0656         }
0657 
0658         if (!(temp & RH_PS_CCS))
0659             break;
0660         if (temp & RH_PS_PRSC)
0661             ohci_writel (ohci, RH_PS_PRSC, portstat);
0662 
0663         /* start the next reset, sleep till it's probably done */
0664         ohci_writel (ohci, RH_PS_PRS, portstat);
0665         msleep(PORT_RESET_HW_MSEC);
0666         now = ohci_readl(ohci, &ohci->regs->fmnumber);
0667     } while (tick_before(now, reset_done) && --limit_1 >= 0);
0668 
0669     /* caller synchronizes using PRSC ... and handles PRS
0670      * still being set when this returns.
0671      */
0672 
0673     return 0;
0674 }
0675 
0676 int ohci_hub_control(
0677     struct usb_hcd  *hcd,
0678     u16     typeReq,
0679     u16     wValue,
0680     u16     wIndex,
0681     char        *buf,
0682     u16     wLength
0683 ) {
0684     struct ohci_hcd *ohci = hcd_to_ohci (hcd);
0685     int     ports = ohci->num_ports;
0686     u32     temp;
0687     int     retval = 0;
0688 
0689     if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
0690         return -ESHUTDOWN;
0691 
0692     switch (typeReq) {
0693     case ClearHubFeature:
0694         switch (wValue) {
0695         case C_HUB_OVER_CURRENT:
0696             ohci_writel (ohci, RH_HS_OCIC,
0697                     &ohci->regs->roothub.status);
0698             break;
0699         case C_HUB_LOCAL_POWER:
0700             break;
0701         default:
0702             goto error;
0703         }
0704         break;
0705     case ClearPortFeature:
0706         if (!wIndex || wIndex > ports)
0707             goto error;
0708         wIndex--;
0709 
0710         switch (wValue) {
0711         case USB_PORT_FEAT_ENABLE:
0712             temp = RH_PS_CCS;
0713             break;
0714         case USB_PORT_FEAT_C_ENABLE:
0715             temp = RH_PS_PESC;
0716             break;
0717         case USB_PORT_FEAT_SUSPEND:
0718             temp = RH_PS_POCI;
0719             break;
0720         case USB_PORT_FEAT_C_SUSPEND:
0721             temp = RH_PS_PSSC;
0722             break;
0723         case USB_PORT_FEAT_POWER:
0724             temp = RH_PS_LSDA;
0725             break;
0726         case USB_PORT_FEAT_C_CONNECTION:
0727             temp = RH_PS_CSC;
0728             break;
0729         case USB_PORT_FEAT_C_OVER_CURRENT:
0730             temp = RH_PS_OCIC;
0731             break;
0732         case USB_PORT_FEAT_C_RESET:
0733             temp = RH_PS_PRSC;
0734             break;
0735         default:
0736             goto error;
0737         }
0738         ohci_writel (ohci, temp,
0739                 &ohci->regs->roothub.portstatus [wIndex]);
0740         // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
0741         break;
0742     case GetHubDescriptor:
0743         ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
0744         break;
0745     case GetHubStatus:
0746         temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
0747         put_unaligned_le32(temp, buf);
0748         break;
0749     case GetPortStatus:
0750         if (!wIndex || wIndex > ports)
0751             goto error;
0752         wIndex--;
0753         temp = roothub_portstatus (ohci, wIndex);
0754         put_unaligned_le32(temp, buf);
0755 
0756         if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
0757             dbg_port(ohci, "GetStatus", wIndex, temp);
0758         break;
0759     case SetHubFeature:
0760         switch (wValue) {
0761         case C_HUB_OVER_CURRENT:
0762             // FIXME:  this can be cleared, yes?
0763         case C_HUB_LOCAL_POWER:
0764             break;
0765         default:
0766             goto error;
0767         }
0768         break;
0769     case SetPortFeature:
0770         if (!wIndex || wIndex > ports)
0771             goto error;
0772         wIndex--;
0773         switch (wValue) {
0774         case USB_PORT_FEAT_SUSPEND:
0775 #ifdef  CONFIG_USB_OTG
0776             if (hcd->self.otg_port == (wIndex + 1)
0777                     && hcd->self.b_hnp_enable)
0778                 ohci->start_hnp(ohci);
0779             else
0780 #endif
0781             ohci_writel (ohci, RH_PS_PSS,
0782                 &ohci->regs->roothub.portstatus [wIndex]);
0783             break;
0784         case USB_PORT_FEAT_POWER:
0785             ohci_writel (ohci, RH_PS_PPS,
0786                 &ohci->regs->roothub.portstatus [wIndex]);
0787             break;
0788         case USB_PORT_FEAT_RESET:
0789             retval = root_port_reset (ohci, wIndex);
0790             break;
0791         default:
0792             goto error;
0793         }
0794         break;
0795 
0796     default:
0797 error:
0798         /* "protocol stall" on error */
0799         retval = -EPIPE;
0800     }
0801     return retval;
0802 }
0803 EXPORT_SYMBOL_GPL(ohci_hub_control);
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