(temp & RH_PS_CCS) ? " CCS" : "" \
);
+/*-------------------------------------------------------------------------*/
+
+#if defined(CONFIG_USB_SUSPEND) || defined(CONFIG_PM)
+
+#define OHCI_SCHED_ENABLES \
+ (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
+
+static void dl_done_list (struct ohci_hcd *, struct pt_regs *);
+static void finish_unlinks (struct ohci_hcd *, u16 , struct pt_regs *);
+
+static int ohci_hub_suspend (struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+ struct usb_device *root = hcd_to_bus (&ohci->hcd)->root_hub;
+ int status = 0;
+
+ if (root->dev.power.power_state != 0)
+ return 0;
+ if (time_before (jiffies, ohci->next_statechange))
+ return -EAGAIN;
+
+ spin_lock_irq (&ohci->lock);
+
+ ohci->hc_control = readl (&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;
+ writel (ohci->hc_control, &ohci->regs->control);
+ (void) readl (&ohci->regs->control);
+ /* FALL THROUGH */
+ case OHCI_USB_RESET:
+ status = -EBUSY;
+ ohci_dbg (ohci, "needs reinit!\n");
+ goto done;
+ case OHCI_USB_SUSPEND:
+ ohci_dbg (ohci, "already suspended?\n");
+ goto succeed;
+ }
+ ohci_dbg (ohci, "suspend root hub\n");
+
+ /* First stop any processing */
+ ohci->hcd.state = USB_STATE_QUIESCING;
+ if (ohci->hc_control & OHCI_SCHED_ENABLES) {
+ int limit;
+
+ ohci->hc_control &= ~OHCI_SCHED_ENABLES;
+ writel (ohci->hc_control, &ohci->regs->control);
+ ohci->hc_control = readl (&ohci->regs->control);
+ writel (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");
+ limit = 2000;
+ while (limit > 0) {
+ udelay (250);
+ limit =- 250;
+ if (readl (&ohci->regs->intrstatus) & OHCI_INTR_SF)
+ break;
+ }
+ dl_done_list (ohci, 0);
+ mdelay (7);
+ }
+ dl_done_list (ohci, 0);
+ finish_unlinks (ohci, OHCI_FRAME_NO(ohci->hcca), 0);
+ writel (readl (&ohci->regs->intrstatus), &ohci->regs->intrstatus);
+
+ /* maybe resume can wake root hub */
+ if (ohci->hcd.remote_wakeup)
+ ohci->hc_control |= OHCI_CTRL_RWE;
+ else
+ ohci->hc_control &= ~OHCI_CTRL_RWE;
+
+ /* Suspend hub */
+ ohci->hc_control &= ~OHCI_CTRL_HCFS;
+ ohci->hc_control |= OHCI_USB_SUSPEND;
+ writel (ohci->hc_control, &ohci->regs->control);
+ (void) readl (&ohci->regs->control);
+
+ /* no resumes until devices finish suspending */
+ ohci->next_statechange = jiffies + msecs_to_jiffies (5);
+
+succeed:
+ /* it's not USB_STATE_SUSPENDED unless access to this
+ * hub from the non-usb side (PCI, SOC, etc) stopped
+ */
+ root->dev.power.power_state = 3;
+done:
+ spin_unlock_irq (&ohci->lock);
+ 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;
+}
+
+static int hc_restart (struct ohci_hcd *ohci);
+
+/* caller owns root->serialize */
+static int ohci_hub_resume (struct usb_hcd *hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci (hcd);
+ struct usb_device *root = hcd_to_bus (&ohci->hcd)->root_hub;
+ u32 temp, enables;
+ int status = -EINPROGRESS;
+
+ if (!root->dev.power.power_state)
+ return 0;
+ if (time_before (jiffies, ohci->next_statechange))
+ return -EAGAIN;
+
+ spin_lock_irq (&ohci->lock);
+ ohci->hc_control = readl (&ohci->regs->control);
+ 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;
+ writel (ohci->hc_control, &ohci->regs->control);
+ (void) readl (&ohci->regs->control);
+ ohci_dbg (ohci, "resume root hub\n");
+ break;
+ case OHCI_USB_RESUME:
+ /* HCFS changes sometime after INTR_RD */
+ ohci_info (ohci, "remote wakeup\n");
+ break;
+ case OHCI_USB_OPER:
+ ohci_dbg (ohci, "odd resume\n");
+ root->dev.power.power_state = 0;
+ status = 0;
+ break;
+ default: /* RESET, we lost power */
+ ohci_dbg (ohci, "root hub hardware reset\n");
+ status = -EBUSY;
+ }
+ spin_unlock_irq (&ohci->lock);
+ if (status == -EBUSY)
+ return hc_restart (ohci);
+ if (status != -EINPROGRESS)
+ return status;
+
+ temp = roothub_a (ohci) & RH_A_NDP;
+ enables = 0;
+ while (temp--) {
+ u32 stat = readl (&ohci->regs->roothub.portstatus [temp]);
+
+ /* force global, not selective, resume */
+ if (!(stat & RH_PS_PSS))
+ continue;
+ writel (RH_PS_POCI, &ohci->regs->roothub.portstatus [temp]);
+ }
+
+ /* Some controllers (lucent) need extra-long delays */
+ ohci->hcd.state = USB_STATE_RESUMING;
+ mdelay (20 /* usb 11.5.1.10 */ + 15);
+
+ temp = readl (&ohci->regs->control);
+ temp &= OHCI_CTRL_HCFS;
+ if (temp != OHCI_USB_RESUME) {
+ ohci_err (ohci, "controller won't resume\n");
+ return -EBUSY;
+ }
+
+ /* disable old schedule state, reinit from scratch */
+ writel (0, &ohci->regs->ed_controlhead);
+ writel (0, &ohci->regs->ed_controlcurrent);
+ writel (0, &ohci->regs->ed_bulkhead);
+ writel (0, &ohci->regs->ed_bulkcurrent);
+ writel (0, &ohci->regs->ed_periodcurrent);
+ writel ((u32) ohci->hcca_dma, &ohci->regs->hcca);
+
+ periodic_reinit (ohci);
+
+ /* interrupts might have been disabled */
+ writel (OHCI_INTR_INIT, &ohci->regs->intrenable);
+ if (ohci->ed_rm_list)
+ writel (OHCI_INTR_SF, &ohci->regs->intrenable);
+ writel (readl (&ohci->regs->intrstatus), &ohci->regs->intrstatus);
+
+ /* Then re-enable operations */
+ writel (OHCI_USB_OPER, &ohci->regs->control);
+ (void) readl (&ohci->regs->control);
+ msleep (3);
+
+ temp = OHCI_CONTROL_INIT | OHCI_USB_OPER;
+ if (ohci->hcd.can_wakeup)
+ temp |= OHCI_CTRL_RWC;
+ ohci->hc_control = temp;
+ writel (temp, &ohci->regs->control);
+ (void) readl (&ohci->regs->control);
+
+ /* TRSMRCY */
+ msleep (10);
+ root->dev.power.power_state = 0;
+
+ /* keep it alive for ~5x suspend + resume costs */
+ ohci->next_statechange = jiffies + msecs_to_jiffies (250);
+
+ /* maybe turn schedules back on */
+ enables = 0;
+ temp = 0;
+ if (!ohci->ed_rm_list) {
+ if (ohci->ed_controltail) {
+ writel (find_head (ohci->ed_controltail)->dma,
+ &ohci->regs->ed_controlhead);
+ enables |= OHCI_CTRL_CLE;
+ temp |= OHCI_CLF;
+ }
+ if (ohci->ed_bulktail) {
+ writel (find_head (ohci->ed_bulktail)->dma,
+ &ohci->regs->ed_bulkhead);
+ enables |= OHCI_CTRL_BLE;
+ temp |= OHCI_BLF;
+ }
+ }
+ if (hcd_to_bus (&ohci->hcd)->bandwidth_isoc_reqs
+ || hcd_to_bus (&ohci->hcd)->bandwidth_int_reqs)
+ enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
+ if (enables) {
+ ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
+ ohci->hc_control |= enables;
+ writel (ohci->hc_control, &ohci->regs->control);
+ if (temp)
+ writel (status, &ohci->regs->cmdstatus);
+ (void) readl (&ohci->regs->control);
+ }
+
+ ohci->hcd.state = USB_STATE_RUNNING;
+ return 0;
+}
+
+static void ohci_rh_resume (void *_hcd)
+{
+ struct usb_hcd *hcd = _hcd;
+
+ down (&hcd->self.root_hub->serialize);
+ (void) ohci_hub_resume (hcd);
+ up (&hcd->self.root_hub->serialize);
+}
+
+#else
+
+static void ohci_rh_resume (void *_hcd)
+{
+ struct ohci_hcd *ohci = hcd_to_ohci (_hcd);
+ ohci_dbg(ohci, "rh_resume ??\n");
+}
+
+#endif /* CONFIG_USB_SUSPEND || CONFIG_PM */
/*-------------------------------------------------------------------------*/
{
struct ohci_hcd *ohci = hcd_to_ohci (hcd);
int ports, i, changed = 0, length = 1;
+ int can_suspend = 1;
ports = roothub_a (ohci) & RH_A_NDP;
if (ports > MAX_ROOT_PORTS) {
for (i = 0; i < ports; i++) {
u32 status = roothub_portstatus (ohci, i);
- status &= RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
- | RH_PS_OCIC | RH_PS_PRSC;
- if (status) {
+ 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);
+ continue;
}
+
+ /* can suspend if no ports are enabled; or if all all
+ * enabled ports are suspended AND remote wakeup is on.
+ */
+ if (!(status & RH_PS_CCS))
+ continue;
+ if ((status & RH_PS_PSS) && ohci->hcd.remote_wakeup)
+ continue;
+ can_suspend = 0;
}
+
+#ifdef CONFIG_PM
+ /* save power by suspending idle root hubs;
+ * INTR_RD wakes us when there's work
+ */
+ if (can_suspend
+ && !changed
+ && !ohci->ed_rm_list
+ && ((OHCI_CTRL_HCFS | OHCI_SCHED_ENABLES)
+ & ohci->hc_control)
+ == OHCI_USB_OPER
+ && down_trylock (&hcd->self.root_hub->serialize) == 0
+ ) {
+ ohci_vdbg (ohci, "autosuspend\n");
+ (void) ohci_hub_suspend (&ohci->hcd);
+ ohci->hcd.state = USB_STATE_RUNNING;
+ up (&hcd->self.root_hub->serialize);
+ }
+#endif
+
return changed ? length : 0;
}
break;
case USB_PORT_FEAT_SUSPEND:
temp = RH_PS_POCI;
+ if ((ohci->hc_control & OHCI_CTRL_HCFS)
+ != OHCI_USB_OPER)
+ schedule_work (&ohci->rh_resume);
break;
case USB_PORT_FEAT_C_SUSPEND:
temp = RH_PS_PSSC;
git://git.onelab.eu / linux-2.6.git / blobdiff