Gabor Juhos
17 years ago
parent
64e1a619c2
commit
cda3dc3ae1
@ -0,0 +1,440 @@ |
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/*
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* OHCI HCD (Host Controller Driver) for USB. |
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* |
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* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> |
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* (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net> |
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* |
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* This file is licenced under GPL |
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*/ |
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#define OHCI_SCHED_ENABLES \ |
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(OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE) |
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#ifdef CONFIG_PM |
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static int admhc_restart(struct admhcd *ahcd); |
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static int admhc_rh_suspend(struct admhcd *ahcd, int autostop) |
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__releases(ahcd->lock) |
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__acquires(ahcd->lock) |
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{ |
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int status = 0; |
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ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control); |
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switch (ahcd->hc_control & OHCI_CTRL_HCFS) { |
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case OHCI_USB_RESUME: |
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admhc_dbg(ahcd, "resume/suspend?\n"); |
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ahcd->hc_control &= ~OHCI_CTRL_HCFS; |
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ahcd->hc_control |= OHCI_USB_RESET; |
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admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control); |
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(void) admhc_readl(ahcd, &ahcd->regs->control); |
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/* FALL THROUGH */ |
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case OHCI_USB_RESET: |
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status = -EBUSY; |
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admhc_dbg(ahcd, "needs reinit!\n"); |
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goto done; |
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case OHCI_USB_SUSPEND: |
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if (!ahcd->autostop) { |
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admhc_dbg(ahcd, "already suspended\n"); |
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goto done; |
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} |
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} |
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admhc_dbg(ahcd, "%s root hub\n", |
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autostop ? "auto-stop" : "suspend"); |
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|
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/* First stop any processing */ |
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if (!autostop && (ahcd->hc_control & OHCI_SCHED_ENABLES)) { |
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ahcd->hc_control &= ~OHCI_SCHED_ENABLES; |
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admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control); |
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ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control); |
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admhc_writel(ahcd, OHCI_INTR_SF, &ahcd->regs->intrstatus); |
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/* sched disables take effect on the next frame,
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* then the last WDH could take 6+ msec |
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*/ |
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admhc_dbg(ahcd, "stopping schedules ...\n"); |
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ahcd->autostop = 0; |
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spin_unlock_irq (&ahcd->lock); |
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msleep (8); |
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spin_lock_irq(&ahcd->lock); |
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} |
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dl_done_list (ahcd); |
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finish_unlinks (ahcd, admhc_frame_no(ahcd)); |
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/* maybe resume can wake root hub */ |
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if (device_may_wakeup(&admhcd_to_hcd(ahcd)->self.root_hub->dev) || |
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autostop) |
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ahcd->hc_control |= OHCI_CTRL_RWE; |
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else { |
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admhc_writel(ahcd, OHCI_INTR_RHSC, &ahcd->regs->intrdisable); |
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ahcd->hc_control &= ~OHCI_CTRL_RWE; |
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} |
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/* Suspend hub ... this is the "global (to this bus) suspend" mode,
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* which doesn't imply ports will first be individually suspended. |
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*/ |
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ahcd->hc_control &= ~OHCI_CTRL_HCFS; |
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ahcd->hc_control |= OHCI_USB_SUSPEND; |
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admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control); |
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(void) admhc_readl(ahcd, &ahcd->regs->control); |
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/* no resumes until devices finish suspending */ |
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if (!autostop) { |
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ahcd->next_statechange = jiffies + msecs_to_jiffies (5); |
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ahcd->autostop = 0; |
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} |
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done: |
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return status; |
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} |
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static inline struct ed *find_head(struct ed *ed) |
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{ |
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/* for bulk and control lists */ |
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while (ed->ed_prev) |
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ed = ed->ed_prev; |
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return ed; |
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} |
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/* caller has locked the root hub */ |
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static int admhc_rh_resume(struct admhcd *ahcd) |
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__releases(ahcd->lock) |
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__acquires(ahcd->lock) |
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{ |
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struct usb_hcd *hcd = admhcd_to_hcd (ahcd); |
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u32 temp, enables; |
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int status = -EINPROGRESS; |
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int autostopped = ahcd->autostop; |
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ahcd->autostop = 0; |
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ahcd->hc_control = admhc_readl(ahcd, &ahcd->regs->control); |
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if (ahcd->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) { |
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/* this can happen after resuming a swsusp snapshot */ |
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if (hcd->state == HC_STATE_RESUMING) { |
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admhc_dbg(ahcd, "BIOS/SMM active, control %03x\n", |
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ahcd->hc_control); |
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status = -EBUSY; |
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/* this happens when pmcore resumes HC then root */ |
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} else { |
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admhc_dbg(ahcd, "duplicate resume\n"); |
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status = 0; |
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} |
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} else switch (ahcd->hc_control & OHCI_CTRL_HCFS) { |
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case OHCI_USB_SUSPEND: |
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ahcd->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES); |
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ahcd->hc_control |= OHCI_USB_RESUME; |
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admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control); |
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(void) admhc_readl(ahcd, &ahcd->regs->control); |
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admhc_dbg(ahcd, "%s root hub\n", |
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autostopped ? "auto-start" : "resume"); |
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break; |
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case OHCI_USB_RESUME: |
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/* HCFS changes sometime after INTR_RD */ |
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admhc_dbg(ahcd, "%swakeup root hub\n", |
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autostopped ? "auto-" : ""); |
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break; |
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case OHCI_USB_OPER: |
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/* this can happen after resuming a swsusp snapshot */ |
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admhc_dbg(ahcd, "snapshot resume? reinit\n"); |
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status = -EBUSY; |
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break; |
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default: /* RESET, we lost power */ |
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admhc_dbg(ahcd, "lost power\n"); |
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status = -EBUSY; |
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} |
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if (status == -EBUSY) { |
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if (!autostopped) { |
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spin_unlock_irq (&ahcd->lock); |
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(void) ahcd_init (ahcd); |
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status = admhc_restart (ahcd); |
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spin_lock_irq(&ahcd->lock); |
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} |
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return status; |
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} |
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if (status != -EINPROGRESS) |
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return status; |
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if (autostopped) |
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goto skip_resume; |
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spin_unlock_irq (&ahcd->lock); |
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/* Some controllers (lucent erratum) need extra-long delays */ |
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msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1); |
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temp = admhc_readl(ahcd, &ahcd->regs->control); |
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temp &= OHCI_CTRL_HCFS; |
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if (temp != OHCI_USB_RESUME) { |
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admhc_err (ahcd, "controller won't resume\n"); |
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spin_lock_irq(&ahcd->lock); |
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return -EBUSY; |
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} |
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/* disable old schedule state, reinit from scratch */ |
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admhc_writel(ahcd, 0, &ahcd->regs->ed_controlhead); |
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admhc_writel(ahcd, 0, &ahcd->regs->ed_controlcurrent); |
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admhc_writel(ahcd, 0, &ahcd->regs->ed_bulkhead); |
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admhc_writel(ahcd, 0, &ahcd->regs->ed_bulkcurrent); |
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admhc_writel(ahcd, 0, &ahcd->regs->ed_periodcurrent); |
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admhc_writel(ahcd, (u32) ahcd->hcca_dma, &ahcd->ahcd->regs->hcca); |
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/* Sometimes PCI D3 suspend trashes frame timings ... */ |
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periodic_reinit(ahcd); |
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/* the following code is executed with ahcd->lock held and
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* irqs disabled if and only if autostopped is true |
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*/ |
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skip_resume: |
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/* interrupts might have been disabled */ |
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admhc_writel(ahcd, OHCI_INTR_INIT, &ahcd->regs->int_enable); |
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if (ahcd->ed_rm_list) |
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admhc_writel(ahcd, OHCI_INTR_SF, &ahcd->regs->int_enable); |
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/* Then re-enable operations */ |
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admhc_writel(ahcd, OHCI_USB_OPER, &ahcd->regs->control); |
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(void) admhc_readl(ahcd, &ahcd->regs->control); |
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if (!autostopped) |
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msleep (3); |
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temp = ahcd->hc_control; |
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temp &= OHCI_CTRL_RWC; |
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temp |= OHCI_CONTROL_INIT | OHCI_USB_OPER; |
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ahcd->hc_control = temp; |
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admhc_writel(ahcd, temp, &ahcd->regs->control); |
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(void) admhc_readl(ahcd, &ahcd->regs->control); |
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/* TRSMRCY */ |
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if (!autostopped) { |
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msleep (10); |
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spin_lock_irq(&ahcd->lock); |
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} |
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/* now ahcd->lock is always held and irqs are always disabled */ |
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/* keep it alive for more than ~5x suspend + resume costs */ |
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ahcd->next_statechange = jiffies + STATECHANGE_DELAY; |
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/* maybe turn schedules back on */ |
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enables = 0; |
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temp = 0; |
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if (!ahcd->ed_rm_list) { |
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if (ahcd->ed_controltail) { |
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admhc_writel(ahcd, |
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find_head (ahcd->ed_controltail)->dma, |
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&ahcd->regs->ed_controlhead); |
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enables |= OHCI_CTRL_CLE; |
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temp |= OHCI_CLF; |
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} |
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if (ahcd->ed_bulktail) { |
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admhc_writel(ahcd, find_head (ahcd->ed_bulktail)->dma, |
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&ahcd->regs->ed_bulkhead); |
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enables |= OHCI_CTRL_BLE; |
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temp |= OHCI_BLF; |
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} |
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} |
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if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs) |
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enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE; |
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if (enables) { |
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admhc_dbg(ahcd, "restarting schedules ... %08x\n", enables); |
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ahcd->hc_control |= enables; |
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admhc_writel(ahcd, ahcd->hc_control, &ahcd->ahcd->regs->control); |
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if (temp) |
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admhc_writel(ahcd, temp, &ahcd->regs->cmdstatus); |
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(void) admhc_readl(ahcd, &ahcd->regs->control); |
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} |
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return 0; |
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} |
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static int admhc_bus_suspend(struct usb_hcd *hcd) |
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{ |
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struct admhcd *ahcd = hcd_to_admhcd(hcd); |
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int rc; |
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spin_lock_irq(&ahcd->lock); |
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if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) |
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rc = -ESHUTDOWN; |
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else |
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rc = admhc_rh_suspend(ahcd, 0); |
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spin_unlock_irq(&ahcd->lock); |
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return rc; |
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} |
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static int admhc_bus_resume(struct usb_hcd *hcd) |
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{ |
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struct admhcd *ahcd = hcd_to_admhcd(hcd); |
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int rc; |
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if (time_before(jiffies, ahcd->next_statechange)) |
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msleep(5); |
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spin_lock_irq(&ahcd->lock); |
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if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))) |
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rc = -ESHUTDOWN; |
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else |
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rc = admhc_rh_resume(ahcd); |
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spin_unlock_irq(&ahcd->lock); |
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/* poll until we know a device is connected or we autostop */ |
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if (rc == 0) |
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usb_hcd_poll_rh_status(hcd); |
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return rc; |
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} |
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/* Carry out polling-, autostop-, and autoresume-related state changes */ |
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static int admhc_root_hub_state_changes(struct admhcd *ahcd, int changed, |
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int any_connected) |
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{ |
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int poll_rh = 1; |
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switch (ahcd->hc_control & OHCI_CTRL_HCFS) { |
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case OHCI_USB_OPER: |
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/* keep on polling until we know a device is connected
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* and RHSC is enabled */ |
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if (!ahcd->autostop) { |
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if (any_connected || |
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!device_may_wakeup(&admhcd_to_hcd(ahcd) |
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->self.root_hub->dev)) { |
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if (admhc_readl(ahcd, &ahcd->regs->int_enable) & |
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OHCI_INTR_RHSC) |
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poll_rh = 0; |
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} else { |
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ahcd->autostop = 1; |
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ahcd->next_statechange = jiffies + HZ; |
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} |
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/* if no devices have been attached for one second, autostop */ |
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} else { |
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if (changed || any_connected) { |
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ahcd->autostop = 0; |
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ahcd->next_statechange = jiffies + |
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STATECHANGE_DELAY; |
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} else if (time_after_eq(jiffies, |
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ahcd->next_statechange) |
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&& !ahcd->ed_rm_list |
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&& !(ahcd->hc_control & |
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OHCI_SCHED_ENABLES)) { |
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ahcd_rh_suspend(ahcd, 1); |
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} |
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} |
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break; |
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/* if there is a port change, autostart or ask to be resumed */ |
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case OHCI_USB_SUSPEND: |
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case OHCI_USB_RESUME: |
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if (changed) { |
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if (ahcd->autostop) |
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admhc_rh_resume(ahcd); |
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else |
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usb_hcd_resume_root_hub(admhcd_to_hcd(ahcd)); |
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} else { |
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/* everything is idle, no need for polling */ |
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poll_rh = 0; |
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} |
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break; |
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} |
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return poll_rh; |
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} |
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/*-------------------------------------------------------------------------*/ |
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/* must not be called from interrupt context */ |
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static int admhc_restart(struct admhcd *ahcd) |
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{ |
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int temp; |
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int i; |
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struct urb_priv *priv; |
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/* mark any devices gone, so they do nothing till khubd disconnects.
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* recycle any "live" eds/tds (and urbs) right away. |
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* later, khubd disconnect processing will recycle the other state, |
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* (either as disconnect/reconnect, or maybe someday as a reset). |
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*/ |
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spin_lock_irq(&ahcd->lock); |
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admhc_disable(ahcd); |
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usb_root_hub_lost_power(admhcd_to_hcd(ahcd)->self.root_hub); |
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if (!list_empty(&ahcd->pending)) |
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admhc_dbg(ahcd, "abort schedule...\n"); |
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list_for_each_entry(priv, &ahcd->pending, pending) { |
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struct urb *urb = priv->td[0]->urb; |
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struct ed *ed = priv->ed; |
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switch (ed->state) { |
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case ED_OPER: |
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ed->state = ED_UNLINK; |
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ed->hwINFO |= cpu_to_hc32(ahcd, ED_DEQUEUE); |
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ed_deschedule (ahcd, ed); |
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ed->ed_next = ahcd->ed_rm_list; |
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ed->ed_prev = NULL; |
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ahcd->ed_rm_list = ed; |
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/* FALLTHROUGH */ |
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case ED_UNLINK: |
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break; |
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default: |
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admhc_dbg(ahcd, "bogus ed %p state %d\n", |
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ed, ed->state); |
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} |
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spin_lock(&urb->lock); |
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urb->status = -ESHUTDOWN; |
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spin_unlock(&urb->lock); |
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} |
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finish_unlinks(ahcd, 0); |
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spin_unlock_irq(&ahcd->lock); |
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/* paranoia, in case that didn't work: */ |
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/* empty the interrupt branches */ |
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for (i = 0; i < NUM_INTS; i++) ahcd->load[i] = 0; |
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for (i = 0; i < NUM_INTS; i++) ahcd->hcca->int_table[i] = 0; |
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/* no EDs to remove */ |
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ahcd->ed_rm_list = NULL; |
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/* empty control and bulk lists */ |
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ahcd->ed_controltail = NULL; |
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ahcd->ed_bulktail = NULL; |
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if ((temp = admhc_run(ahcd)) < 0) { |
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admhc_err(ahcd, "can't restart, %d\n", temp); |
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return temp; |
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} else { |
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/* here we "know" root ports should always stay powered,
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* and that if we try to turn them back on the root hub |
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* will respond to CSC processing. |
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*/ |
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i = ahcd->num_ports; |
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while (i--) |
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admhc_writel(ahcd, RH_PS_PSS, |
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&ahcd->regs->portstatus[i]); |
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admhc_dbg(ahcd, "restart complete\n"); |
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} |
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return 0; |
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} |
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#else /* CONFIG_PM */ |
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static inline int admhc_rh_resume(struct admhcd *ahcd) |
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{ |
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return 0; |
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} |
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/* Carry out polling-related state changes.
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* autostop isn't used when CONFIG_PM is turned off. |
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*/ |
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static int admhc_root_hub_state_changes(struct admhcd *ahcd, int changed, |
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int any_connected) |
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{ |
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int poll_rh = 1; |
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/* keep on polling until RHSC is enabled */ |
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if (admhc_readl(ahcd, &ahcd->regs->int_enable) & ADMHC_INTR_INSM) |
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poll_rh = 0; |
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return poll_rh; |
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} |
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#endif /* CONFIG_PM */ |
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