zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/usb/host/ohci-hub.c b/ap/os/linux/linux-3.4.x/drivers/usb/host/ohci-hub.c
new file mode 100644
index 0000000..836772d
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/usb/host/ohci-hub.c
@@ -0,0 +1,825 @@
+/*
+ * OHCI HCD (Host Controller Driver) for USB.
+ *
+ * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
+ *
+ * This file is licenced under GPL
+ */
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * OHCI Root Hub ... the nonsharable stuff
+ */
+
+#define dbg_port(hc,label,num,value) \
+ ohci_dbg (hc, \
+ "%s roothub.portstatus [%d] " \
+ "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
+ label, num, temp, \
+ (temp & RH_PS_PRSC) ? " PRSC" : "", \
+ (temp & RH_PS_OCIC) ? " OCIC" : "", \
+ (temp & RH_PS_PSSC) ? " PSSC" : "", \
+ (temp & RH_PS_PESC) ? " PESC" : "", \
+ (temp & RH_PS_CSC) ? " CSC" : "", \
+ \
+ (temp & RH_PS_LSDA) ? " LSDA" : "", \
+ (temp & RH_PS_PPS) ? " PPS" : "", \
+ (temp & RH_PS_PRS) ? " PRS" : "", \
+ (temp & RH_PS_POCI) ? " POCI" : "", \
+ (temp & RH_PS_PSS) ? " PSS" : "", \
+ \
+ (temp & RH_PS_PES) ? " PES" : "", \
+ (temp & RH_PS_CCS) ? " CCS" : "" \
+ );
+
+/*-------------------------------------------------------------------------*/
+
+#define OHCI_SCHED_ENABLES \
+ (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
+
+static void dl_done_list (struct ohci_hcd *);
+static void finish_unlinks (struct ohci_hcd *, u16);
+
+#ifdef CONFIG_PM
+static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop)
+__releases(ohci->lock)
+__acquires(ohci->lock)
+{
+ int status = 0;
+
+ ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
+ switch (ohci->hc_control & OHCI_CTRL_HCFS) {
+ case OHCI_USB_RESUME:
+ ohci_dbg (ohci, "resume/suspend?\n");
+ ohci->hc_control &= ~OHCI_CTRL_HCFS;
+ ohci->hc_control |= OHCI_USB_RESET;
+ ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
+ (void) ohci_readl (ohci, &ohci->regs->control);
+ /* FALL THROUGH */
+ case OHCI_USB_RESET:
+ status = -EBUSY;
+ ohci_dbg (ohci, "needs reinit!\n");
+ goto done;
+ case OHCI_USB_SUSPEND:
+ if (!ohci->autostop) {
+ ohci_dbg (ohci, "already suspended\n");
+ goto done;
+ }
+ }
+ ohci_dbg (ohci, "%s root hub\n",
+ autostop ? "auto-stop" : "suspend");
+
+ /* First stop any processing */
+ if (!autostop && (ohci->hc_control & OHCI_SCHED_ENABLES)) {
+ ohci->hc_control &= ~OHCI_SCHED_ENABLES;
+ ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
+ ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
+ ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
+
+ /* sched disables take effect on the next frame,
+ * then the last WDH could take 6+ msec
+ */
+ ohci_dbg (ohci, "stopping schedules ...\n");
+ ohci->autostop = 0;
+ spin_unlock_irq (&ohci->lock);
+ msleep (8);
+ spin_lock_irq (&ohci->lock);
+ }
+ dl_done_list (ohci);
+ finish_unlinks (ohci, ohci_frame_no(ohci));
+
+ /* maybe resume can wake root hub */
+ if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) {
+ ohci->hc_control |= OHCI_CTRL_RWE;
+ } else {
+ ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD,
+ &ohci->regs->intrdisable);
+ ohci->hc_control &= ~OHCI_CTRL_RWE;
+ }
+
+ /* Suspend hub ... this is the "global (to this bus) suspend" mode,
+ * which doesn't imply ports will first be individually suspended.
+ */
+ ohci->hc_control &= ~OHCI_CTRL_HCFS;
+ ohci->hc_control |= OHCI_USB_SUSPEND;
+ ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
+ (void) ohci_readl (ohci, &ohci->regs->control);
+
+ /* no resumes until devices finish suspending */
+ if (!autostop) {
+ ohci->next_statechange = jiffies + msecs_to_jiffies (5);
+ ohci->autostop = 0;
+ ohci->rh_state = OHCI_RH_SUSPENDED;
+ }
+
+done:
+ return status;
+}
+
+static inline struct ed *find_head (struct ed *ed)
+{
+ /* for bulk and control lists */
+ while (ed->ed_prev)
+ ed = ed->ed_prev;
+ return ed;
+}
+
+/* caller has locked the root hub */
+static int ohci_rh_resume (struct ohci_hcd *ohci)
+__releases(ohci->lock)
+__acquires(ohci->lock)
+{
+ struct usb_hcd *hcd = ohci_to_hcd (ohci);
+ u32 temp, enables;
+ int status = -EINPROGRESS;
+ int autostopped = ohci->autostop;
+
+ ohci->autostop = 0;
+ ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
+
+ if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
+ /* this can happen after resuming a swsusp snapshot */
+ if (ohci->rh_state != OHCI_RH_RUNNING) {
+ ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
+ ohci->hc_control);
+ status = -EBUSY;
+ /* this happens when pmcore resumes HC then root */
+ } else {
+ ohci_dbg (ohci, "duplicate resume\n");
+ status = 0;
+ }
+ } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
+ case OHCI_USB_SUSPEND:
+ ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
+ ohci->hc_control |= OHCI_USB_RESUME;
+ ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
+ (void) ohci_readl (ohci, &ohci->regs->control);
+ ohci_dbg (ohci, "%s root hub\n",
+ autostopped ? "auto-start" : "resume");
+ break;
+ case OHCI_USB_RESUME:
+ /* HCFS changes sometime after INTR_RD */
+ ohci_dbg(ohci, "%swakeup root hub\n",
+ autostopped ? "auto-" : "");
+ break;
+ case OHCI_USB_OPER:
+ /* this can happen after resuming a swsusp snapshot */
+ ohci_dbg (ohci, "snapshot resume? reinit\n");
+ status = -EBUSY;
+ break;
+ default: /* RESET, we lost power */
+ ohci_dbg (ohci, "lost power\n");
+ status = -EBUSY;
+ }
+ if (status == -EBUSY) {
+ if (!autostopped) {
+ spin_unlock_irq (&ohci->lock);
+ (void) ohci_init (ohci);
+ status = ohci_restart (ohci);
+
+ usb_root_hub_lost_power(hcd->self.root_hub);
+
+ spin_lock_irq (&ohci->lock);
+ }
+ return status;
+ }
+ if (status != -EINPROGRESS)
+ return status;
+ if (autostopped)
+ goto skip_resume;
+ spin_unlock_irq (&ohci->lock);
+
+ /* Some controllers (lucent erratum) need extra-long delays */
+ msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
+
+ temp = ohci_readl (ohci, &ohci->regs->control);
+ temp &= OHCI_CTRL_HCFS;
+ if (temp != OHCI_USB_RESUME) {
+ ohci_err (ohci, "controller won't resume\n");
+ spin_lock_irq(&ohci->lock);
+ return -EBUSY;
+ }
+
+ /* disable old schedule state, reinit from scratch */
+ ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
+ ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
+ ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
+ ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
+ ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
+ ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
+
+ /* Sometimes PCI D3 suspend trashes frame timings ... */
+ periodic_reinit (ohci);
+
+ /* the following code is executed with ohci->lock held and
+ * irqs disabled if and only if autostopped is true
+ */
+
+skip_resume:
+ /* interrupts might have been disabled */
+ ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
+ if (ohci->ed_rm_list)
+ ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
+
+ /* Then re-enable operations */
+ ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
+ (void) ohci_readl (ohci, &ohci->regs->control);
+ if (!autostopped)
+ msleep (3);
+
+ temp = ohci->hc_control;
+ temp &= OHCI_CTRL_RWC;
+ temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER;
+ ohci->hc_control = temp;
+ ohci_writel (ohci, temp, &ohci->regs->control);
+ (void) ohci_readl (ohci, &ohci->regs->control);
+
+ /* TRSMRCY */
+ if (!autostopped) {
+ msleep (10);
+ spin_lock_irq (&ohci->lock);
+ }
+ /* now ohci->lock is always held and irqs are always disabled */
+
+ /* keep it alive for more than ~5x suspend + resume costs */
+ ohci->next_statechange = jiffies + STATECHANGE_DELAY;
+
+ /* maybe turn schedules back on */
+ enables = 0;
+ temp = 0;
+ if (!ohci->ed_rm_list) {
+ if (ohci->ed_controltail) {
+ ohci_writel (ohci,
+ find_head (ohci->ed_controltail)->dma,
+ &ohci->regs->ed_controlhead);
+ enables |= OHCI_CTRL_CLE;
+ temp |= OHCI_CLF;
+ }
+ if (ohci->ed_bulktail) {
+ ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
+ &ohci->regs->ed_bulkhead);
+ enables |= OHCI_CTRL_BLE;
+ temp |= OHCI_BLF;
+ }
+ }
+ if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
+ enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
+ if (enables) {
+ ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
+ ohci->hc_control |= enables;
+ ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
+ if (temp)
+ ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
+ (void) ohci_readl (ohci, &ohci->regs->control);
+ }
+
+ ohci->rh_state = OHCI_RH_RUNNING;
+ return 0;
+}
+
+static int ohci_bus_suspend (struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+ int rc;
+
+ spin_lock_irq (&ohci->lock);
+
+ if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
+ rc = -ESHUTDOWN;
+ else
+ rc = ohci_rh_suspend (ohci, 0);
+ spin_unlock_irq (&ohci->lock);
+ return rc;
+}
+
+static int ohci_bus_resume (struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+ int rc;
+
+ if (time_before (jiffies, ohci->next_statechange))
+ msleep(5);
+
+ spin_lock_irq (&ohci->lock);
+
+ if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
+ rc = -ESHUTDOWN;
+ else
+ rc = ohci_rh_resume (ohci);
+ spin_unlock_irq (&ohci->lock);
+
+ /* poll until we know a device is connected or we autostop */
+ if (rc == 0)
+ usb_hcd_poll_rh_status(hcd);
+ return rc;
+}
+
+/* Carry out the final steps of resuming the controller device */
+static void ohci_finish_controller_resume(struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci(hcd);
+ int port;
+ bool need_reinit = false;
+
+ /* See if the controller is already running or has been reset */
+ ohci->hc_control = ohci_readl(ohci, &ohci->regs->control);
+ if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
+ need_reinit = true;
+ } else {
+ switch (ohci->hc_control & OHCI_CTRL_HCFS) {
+ case OHCI_USB_OPER:
+ case OHCI_USB_RESET:
+ need_reinit = true;
+ }
+ }
+
+ /* If needed, reinitialize and suspend the root hub */
+ if (need_reinit) {
+ spin_lock_irq(&ohci->lock);
+ ohci_rh_resume(ohci);
+ ohci_rh_suspend(ohci, 0);
+ spin_unlock_irq(&ohci->lock);
+ }
+
+ /* Normally just turn on port power and enable interrupts */
+ else {
+ ohci_dbg(ohci, "powerup ports\n");
+ for (port = 0; port < ohci->num_ports; port++)
+ ohci_writel(ohci, RH_PS_PPS,
+ &ohci->regs->roothub.portstatus[port]);
+
+ ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrenable);
+ ohci_readl(ohci, &ohci->regs->intrenable);
+ msleep(20);
+ }
+
+ usb_hcd_resume_root_hub(hcd);
+}
+
+/* Carry out polling-, autostop-, and autoresume-related state changes */
+static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
+ int any_connected, int rhsc_status)
+{
+ int poll_rh = 1;
+ int rhsc_enable;
+
+ /* Some broken controllers never turn off RHSC in the interrupt
+ * status register. For their sake we won't re-enable RHSC
+ * interrupts if the interrupt bit is already active.
+ */
+ rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) &
+ OHCI_INTR_RHSC;
+
+ switch (ohci->hc_control & OHCI_CTRL_HCFS) {
+ case OHCI_USB_OPER:
+ /* If no status changes are pending, enable RHSC interrupts. */
+ if (!rhsc_enable && !rhsc_status && !changed) {
+ rhsc_enable = OHCI_INTR_RHSC;
+ ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable);
+ }
+
+ /* Keep on polling until we know a device is connected
+ * and RHSC is enabled, or until we autostop.
+ */
+ if (!ohci->autostop) {
+ if (any_connected ||
+ !device_may_wakeup(&ohci_to_hcd(ohci)
+ ->self.root_hub->dev)) {
+ if (rhsc_enable)
+ poll_rh = 0;
+ } else {
+ ohci->autostop = 1;
+ ohci->next_statechange = jiffies + HZ;
+ }
+
+ /* if no devices have been attached for one second, autostop */
+ } else {
+ if (changed || any_connected) {
+ ohci->autostop = 0;
+ ohci->next_statechange = jiffies +
+ STATECHANGE_DELAY;
+ } else if (time_after_eq(jiffies,
+ ohci->next_statechange)
+ && !ohci->ed_rm_list
+ && !(ohci->hc_control &
+ OHCI_SCHED_ENABLES)) {
+ ohci_rh_suspend(ohci, 1);
+ if (rhsc_enable)
+ poll_rh = 0;
+ }
+ }
+ break;
+
+ case OHCI_USB_SUSPEND:
+ case OHCI_USB_RESUME:
+ /* if there is a port change, autostart or ask to be resumed */
+ if (changed) {
+ if (ohci->autostop)
+ ohci_rh_resume(ohci);
+ else
+ usb_hcd_resume_root_hub(ohci_to_hcd(ohci));
+
+ /* If remote wakeup is disabled, stop polling */
+ } else if (!ohci->autostop &&
+ !ohci_to_hcd(ohci)->self.root_hub->
+ do_remote_wakeup) {
+ poll_rh = 0;
+
+ } else {
+ /* If no status changes are pending,
+ * enable RHSC interrupts
+ */
+ if (!rhsc_enable && !rhsc_status) {
+ rhsc_enable = OHCI_INTR_RHSC;
+ ohci_writel(ohci, rhsc_enable,
+ &ohci->regs->intrenable);
+ }
+ /* Keep polling until RHSC is enabled */
+ if (rhsc_enable)
+ poll_rh = 0;
+ }
+ break;
+ }
+ return poll_rh;
+}
+
+#else /* CONFIG_PM */
+
+static inline int ohci_rh_resume(struct ohci_hcd *ohci)
+{
+ return 0;
+}
+
+/* Carry out polling-related state changes.
+ * autostop isn't used when CONFIG_PM is turned off.
+ */
+static int ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed,
+ int any_connected, int rhsc_status)
+{
+ /* If RHSC is enabled, don't poll */
+ if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC)
+ return 0;
+
+ /* If status changes are pending, continue polling.
+ * Conversely, if no status changes are pending but the RHSC
+ * status bit was set, then RHSC may be broken so continue polling.
+ */
+ if (changed || rhsc_status)
+ return 1;
+
+ /* It's safe to re-enable RHSC interrupts */
+ ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable);
+ return 0;
+}
+
+#endif /* CONFIG_PM */
+
+/*-------------------------------------------------------------------------*/
+
+/* build "status change" packet (one or two bytes) from HC registers */
+
+static int
+ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+ int i, changed = 0, length = 1;
+ int any_connected = 0;
+ int rhsc_status;
+ unsigned long flags;
+
+ spin_lock_irqsave (&ohci->lock, flags);
+ if (!HCD_HW_ACCESSIBLE(hcd))
+ goto done;
+
+ /* undocumented erratum seen on at least rev D */
+ if ((ohci->flags & OHCI_QUIRK_AMD756)
+ && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
+ ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
+ ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
+ /* retry later; "should not happen" */
+ goto done;
+ }
+
+ /* init status */
+ if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
+ buf [0] = changed = 1;
+ else
+ buf [0] = 0;
+ if (ohci->num_ports > 7) {
+ buf [1] = 0;
+ length++;
+ }
+
+ /* Clear the RHSC status flag before reading the port statuses */
+ ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus);
+ rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) &
+ OHCI_INTR_RHSC;
+
+ /* look at each port */
+ for (i = 0; i < ohci->num_ports; i++) {
+ u32 status = roothub_portstatus (ohci, i);
+
+ /* can't autostop if ports are connected */
+ any_connected |= (status & RH_PS_CCS);
+
+ if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
+ | RH_PS_OCIC | RH_PS_PRSC)) {
+ changed = 1;
+ if (i < 7)
+ buf [0] |= 1 << (i + 1);
+ else
+ buf [1] |= 1 << (i - 7);
+ }
+ }
+
+ if (ohci_root_hub_state_changes(ohci, changed,
+ any_connected, rhsc_status))
+ set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+ else
+ clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+
+
+done:
+ spin_unlock_irqrestore (&ohci->lock, flags);
+
+ return changed ? length : 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static void
+ohci_hub_descriptor (
+ struct ohci_hcd *ohci,
+ struct usb_hub_descriptor *desc
+) {
+ u32 rh = roothub_a (ohci);
+ u16 temp;
+
+ desc->bDescriptorType = 0x29;
+ desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
+ desc->bHubContrCurrent = 0;
+
+ desc->bNbrPorts = ohci->num_ports;
+ temp = 1 + (ohci->num_ports / 8);
+ desc->bDescLength = 7 + 2 * temp;
+
+ temp = 0;
+ if (rh & RH_A_NPS) /* no power switching? */
+ temp |= 0x0002;
+ if (rh & RH_A_PSM) /* per-port power switching? */
+ temp |= 0x0001;
+ if (rh & RH_A_NOCP) /* no overcurrent reporting? */
+ temp |= 0x0010;
+ else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */
+ temp |= 0x0008;
+ desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
+
+ /* ports removable, and usb 1.0 legacy PortPwrCtrlMask */
+ rh = roothub_b (ohci);
+ memset(desc->u.hs.DeviceRemovable, 0xff,
+ sizeof(desc->u.hs.DeviceRemovable));
+ desc->u.hs.DeviceRemovable[0] = rh & RH_B_DR;
+ if (ohci->num_ports > 7) {
+ desc->u.hs.DeviceRemovable[1] = (rh & RH_B_DR) >> 8;
+ desc->u.hs.DeviceRemovable[2] = 0xff;
+ } else
+ desc->u.hs.DeviceRemovable[1] = 0xff;
+}
+
+/*-------------------------------------------------------------------------*/
+
+#ifdef CONFIG_USB_OTG
+
+static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+ u32 status;
+
+ if (!port)
+ return -EINVAL;
+ port--;
+
+ /* start port reset before HNP protocol times out */
+ status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
+ if (!(status & RH_PS_CCS))
+ return -ENODEV;
+
+ /* khubd will finish the reset later */
+ ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
+ return 0;
+}
+
+#else
+
+#define ohci_start_port_reset NULL
+
+#endif
+
+/*-------------------------------------------------------------------------*/
+
+
+/* See usb 7.1.7.5: root hubs must issue at least 50 msec reset signaling,
+ * not necessarily continuous ... to guard against resume signaling.
+ * The short timeout is safe for non-root hubs, and is backward-compatible
+ * with earlier Linux hosts.
+ */
+#ifdef CONFIG_USB_SUSPEND
+#define PORT_RESET_MSEC 50
+#else
+#define PORT_RESET_MSEC 10
+#endif
+
+/* this timer value might be vendor-specific ... */
+#define PORT_RESET_HW_MSEC 10
+
+/* wrap-aware logic morphed from <linux/jiffies.h> */
+#define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
+
+/* called from some task, normally khubd */
+static inline int root_port_reset (struct ohci_hcd *ohci, unsigned port)
+{
+ __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
+ u32 temp = 0;
+ u16 now = ohci_readl(ohci, &ohci->regs->fmnumber);
+ u16 reset_done = now + PORT_RESET_MSEC;
+ int limit_1 = DIV_ROUND_UP(PORT_RESET_MSEC, PORT_RESET_HW_MSEC);
+
+ /* build a "continuous enough" reset signal, with up to
+ * 3msec gap between pulses. scheduler HZ==100 must work;
+ * this might need to be deadline-scheduled.
+ */
+ do {
+ int limit_2;
+
+ /* spin until any current reset finishes */
+ limit_2 = PORT_RESET_HW_MSEC * 2;
+ while (--limit_2 >= 0) {
+ temp = ohci_readl (ohci, portstat);
+ /* handle e.g. CardBus eject */
+ if (temp == ~(u32)0)
+ return -ESHUTDOWN;
+ if (!(temp & RH_PS_PRS))
+ break;
+ udelay (500);
+ }
+
+ /* timeout (a hardware error) has been observed when
+ * EHCI sets CF while this driver is resetting a port;
+ * presumably other disconnect paths might do it too.
+ */
+ if (limit_2 < 0) {
+ ohci_dbg(ohci,
+ "port[%d] reset timeout, stat %08x\n",
+ port, temp);
+ break;
+ }
+
+ if (!(temp & RH_PS_CCS))
+ break;
+ if (temp & RH_PS_PRSC)
+ ohci_writel (ohci, RH_PS_PRSC, portstat);
+
+ /* start the next reset, sleep till it's probably done */
+ ohci_writel (ohci, RH_PS_PRS, portstat);
+ msleep(PORT_RESET_HW_MSEC);
+ now = ohci_readl(ohci, &ohci->regs->fmnumber);
+ } while (tick_before(now, reset_done) && --limit_1 >= 0);
+
+ /* caller synchronizes using PRSC ... and handles PRS
+ * still being set when this returns.
+ */
+
+ return 0;
+}
+
+static int ohci_hub_control (
+ struct usb_hcd *hcd,
+ u16 typeReq,
+ u16 wValue,
+ u16 wIndex,
+ char *buf,
+ u16 wLength
+) {
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+ int ports = ohci->num_ports;
+ u32 temp;
+ int retval = 0;
+
+ if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
+ return -ESHUTDOWN;
+
+ switch (typeReq) {
+ case ClearHubFeature:
+ switch (wValue) {
+ case C_HUB_OVER_CURRENT:
+ ohci_writel (ohci, RH_HS_OCIC,
+ &ohci->regs->roothub.status);
+ case C_HUB_LOCAL_POWER:
+ break;
+ default:
+ goto error;
+ }
+ break;
+ case ClearPortFeature:
+ if (!wIndex || wIndex > ports)
+ goto error;
+ wIndex--;
+
+ switch (wValue) {
+ case USB_PORT_FEAT_ENABLE:
+ temp = RH_PS_CCS;
+ break;
+ case USB_PORT_FEAT_C_ENABLE:
+ temp = RH_PS_PESC;
+ break;
+ case USB_PORT_FEAT_SUSPEND:
+ temp = RH_PS_POCI;
+ break;
+ case USB_PORT_FEAT_C_SUSPEND:
+ temp = RH_PS_PSSC;
+ break;
+ case USB_PORT_FEAT_POWER:
+ temp = RH_PS_LSDA;
+ break;
+ case USB_PORT_FEAT_C_CONNECTION:
+ temp = RH_PS_CSC;
+ break;
+ case USB_PORT_FEAT_C_OVER_CURRENT:
+ temp = RH_PS_OCIC;
+ break;
+ case USB_PORT_FEAT_C_RESET:
+ temp = RH_PS_PRSC;
+ break;
+ default:
+ goto error;
+ }
+ ohci_writel (ohci, temp,
+ &ohci->regs->roothub.portstatus [wIndex]);
+ // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
+ break;
+ case GetHubDescriptor:
+ ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
+ break;
+ case GetHubStatus:
+ temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
+ put_unaligned_le32(temp, buf);
+ break;
+ case GetPortStatus:
+ if (!wIndex || wIndex > ports)
+ goto error;
+ wIndex--;
+ temp = roothub_portstatus (ohci, wIndex);
+ put_unaligned_le32(temp, buf);
+
+#ifndef OHCI_VERBOSE_DEBUG
+ if (*(u16*)(buf+2)) /* only if wPortChange is interesting */
+#endif
+ dbg_port (ohci, "GetStatus", wIndex, temp);
+ break;
+ case SetHubFeature:
+ switch (wValue) {
+ case C_HUB_OVER_CURRENT:
+ // FIXME: this can be cleared, yes?
+ case C_HUB_LOCAL_POWER:
+ break;
+ default:
+ goto error;
+ }
+ break;
+ case SetPortFeature:
+ if (!wIndex || wIndex > ports)
+ goto error;
+ wIndex--;
+ switch (wValue) {
+ case USB_PORT_FEAT_SUSPEND:
+#ifdef CONFIG_USB_OTG
+ if (hcd->self.otg_port == (wIndex + 1)
+ && hcd->self.b_hnp_enable)
+ ohci->start_hnp(ohci);
+ else
+#endif
+ ohci_writel (ohci, RH_PS_PSS,
+ &ohci->regs->roothub.portstatus [wIndex]);
+ break;
+ case USB_PORT_FEAT_POWER:
+ ohci_writel (ohci, RH_PS_PPS,
+ &ohci->regs->roothub.portstatus [wIndex]);
+ break;
+ case USB_PORT_FEAT_RESET:
+ retval = root_port_reset (ohci, wIndex);
+ break;
+ default:
+ goto error;
+ }
+ break;
+
+ default:
+error:
+ /* "protocol stall" on error */
+ retval = -EPIPE;
+ }
+ return retval;
+}
+