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800 lines
21 KiB
800 lines
21 KiB
// SPDX-License-Identifier: GPL-1.0+ |
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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 <[email protected]> |
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* (C) Copyright 2000-2004 David Brownell <[email protected]> |
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* |
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* This file is licenced under GPL |
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*/ |
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|
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/*-------------------------------------------------------------------------*/ |
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|
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/* |
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* OHCI Root Hub ... the nonsharable stuff |
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*/ |
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|
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#define dbg_port(hc,label,num,value) \ |
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ohci_dbg (hc, \ |
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"%s roothub.portstatus [%d] " \ |
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"= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \ |
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label, num, value, \ |
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(value & RH_PS_PRSC) ? " PRSC" : "", \ |
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(value & RH_PS_OCIC) ? " OCIC" : "", \ |
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(value & RH_PS_PSSC) ? " PSSC" : "", \ |
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(value & RH_PS_PESC) ? " PESC" : "", \ |
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(value & RH_PS_CSC) ? " CSC" : "", \ |
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\ |
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(value & RH_PS_LSDA) ? " LSDA" : "", \ |
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(value & RH_PS_PPS) ? " PPS" : "", \ |
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(value & RH_PS_PRS) ? " PRS" : "", \ |
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(value & RH_PS_POCI) ? " POCI" : "", \ |
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(value & RH_PS_PSS) ? " PSS" : "", \ |
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\ |
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(value & RH_PS_PES) ? " PES" : "", \ |
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(value & RH_PS_CCS) ? " CCS" : "" \ |
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); |
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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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static void update_done_list(struct ohci_hcd *); |
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static void ohci_work(struct ohci_hcd *); |
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#ifdef CONFIG_PM |
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static int ohci_rh_suspend (struct ohci_hcd *ohci, int autostop) |
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__releases(ohci->lock) |
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__acquires(ohci->lock) |
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{ |
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int status = 0; |
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ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); |
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switch (ohci->hc_control & OHCI_CTRL_HCFS) { |
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case OHCI_USB_RESUME: |
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ohci_dbg (ohci, "resume/suspend?\n"); |
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ohci->hc_control &= ~OHCI_CTRL_HCFS; |
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ohci->hc_control |= OHCI_USB_RESET; |
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ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); |
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(void) ohci_readl (ohci, &ohci->regs->control); |
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fallthrough; |
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case OHCI_USB_RESET: |
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status = -EBUSY; |
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ohci_dbg (ohci, "needs reinit!\n"); |
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goto done; |
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case OHCI_USB_SUSPEND: |
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if (!ohci->autostop) { |
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ohci_dbg (ohci, "already suspended\n"); |
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goto done; |
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} |
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} |
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ohci_dbg (ohci, "%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 && (ohci->hc_control & OHCI_SCHED_ENABLES)) { |
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ohci->hc_control &= ~OHCI_SCHED_ENABLES; |
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ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); |
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ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); |
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ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus); |
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|
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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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ohci_dbg (ohci, "stopping schedules ...\n"); |
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ohci->autostop = 0; |
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spin_unlock_irq (&ohci->lock); |
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msleep (8); |
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spin_lock_irq (&ohci->lock); |
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} |
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update_done_list(ohci); |
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ohci_work(ohci); |
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/* |
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* Some controllers don't handle "global" suspend properly if |
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* there are unsuspended ports. For these controllers, put all |
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* the enabled ports into suspend before suspending the root hub. |
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*/ |
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if (ohci->flags & OHCI_QUIRK_GLOBAL_SUSPEND) { |
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__hc32 __iomem *portstat = ohci->regs->roothub.portstatus; |
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int i; |
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unsigned temp; |
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for (i = 0; i < ohci->num_ports; (++i, ++portstat)) { |
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temp = ohci_readl(ohci, portstat); |
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if ((temp & (RH_PS_PES | RH_PS_PSS)) == |
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RH_PS_PES) |
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ohci_writel(ohci, RH_PS_PSS, portstat); |
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} |
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} |
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/* maybe resume can wake root hub */ |
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if (ohci_to_hcd(ohci)->self.root_hub->do_remote_wakeup || autostop) { |
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ohci->hc_control |= OHCI_CTRL_RWE; |
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} else { |
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ohci_writel(ohci, OHCI_INTR_RHSC | OHCI_INTR_RD, |
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&ohci->regs->intrdisable); |
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ohci->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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ohci->hc_control &= ~OHCI_CTRL_HCFS; |
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ohci->hc_control |= OHCI_USB_SUSPEND; |
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ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); |
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(void) ohci_readl (ohci, &ohci->regs->control); |
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|
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/* no resumes until devices finish suspending */ |
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if (!autostop) { |
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ohci->next_statechange = jiffies + msecs_to_jiffies (5); |
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ohci->autostop = 0; |
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ohci->rh_state = OHCI_RH_SUSPENDED; |
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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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|
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/* caller has locked the root hub */ |
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static int ohci_rh_resume (struct ohci_hcd *ohci) |
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__releases(ohci->lock) |
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__acquires(ohci->lock) |
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{ |
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struct usb_hcd *hcd = ohci_to_hcd (ohci); |
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u32 temp, enables; |
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int status = -EINPROGRESS; |
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int autostopped = ohci->autostop; |
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ohci->autostop = 0; |
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ohci->hc_control = ohci_readl (ohci, &ohci->regs->control); |
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if (ohci->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 (ohci->rh_state != OHCI_RH_RUNNING) { |
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ohci_dbg (ohci, "BIOS/SMM active, control %03x\n", |
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ohci->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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ohci_dbg (ohci, "duplicate resume\n"); |
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status = 0; |
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} |
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} else switch (ohci->hc_control & OHCI_CTRL_HCFS) { |
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case OHCI_USB_SUSPEND: |
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ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES); |
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ohci->hc_control |= OHCI_USB_RESUME; |
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ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); |
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(void) ohci_readl (ohci, &ohci->regs->control); |
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ohci_dbg (ohci, "%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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ohci_dbg(ohci, "%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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ohci_dbg (ohci, "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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ohci_dbg (ohci, "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 (&ohci->lock); |
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status = ohci_restart (ohci); |
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usb_root_hub_lost_power(hcd->self.root_hub); |
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spin_lock_irq (&ohci->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 (&ohci->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 = ohci_readl (ohci, &ohci->regs->control); |
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temp &= OHCI_CTRL_HCFS; |
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if (temp != OHCI_USB_RESUME) { |
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ohci_err (ohci, "controller won't resume\n"); |
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spin_lock_irq(&ohci->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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ohci_writel (ohci, 0, &ohci->regs->ed_controlhead); |
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ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent); |
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ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead); |
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ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent); |
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ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent); |
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ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca); |
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|
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/* Sometimes PCI D3 suspend trashes frame timings ... */ |
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periodic_reinit (ohci); |
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/* |
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* The following code is executed with ohci->lock held and |
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* irqs disabled if and only if autostopped is true. This |
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* will cause sparse to warn about a "context imbalance". |
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*/ |
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skip_resume: |
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/* interrupts might have been disabled */ |
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ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable); |
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if (ohci->ed_rm_list) |
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ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable); |
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|
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/* Then re-enable operations */ |
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ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control); |
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(void) ohci_readl (ohci, &ohci->regs->control); |
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if (!autostopped) |
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msleep (3); |
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temp = ohci->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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ohci->hc_control = temp; |
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ohci_writel (ohci, temp, &ohci->regs->control); |
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(void) ohci_readl (ohci, &ohci->regs->control); |
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|
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/* TRSMRCY */ |
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if (!autostopped) { |
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msleep (10); |
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spin_lock_irq (&ohci->lock); |
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} |
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/* now ohci->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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ohci->next_statechange = jiffies + STATECHANGE_DELAY; |
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|
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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 (!ohci->ed_rm_list) { |
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if (ohci->ed_controltail) { |
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ohci_writel (ohci, |
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find_head (ohci->ed_controltail)->dma, |
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&ohci->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 (ohci->ed_bulktail) { |
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ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma, |
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&ohci->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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ohci_dbg (ohci, "restarting schedules ... %08x\n", enables); |
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ohci->hc_control |= enables; |
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ohci_writel (ohci, ohci->hc_control, &ohci->regs->control); |
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if (temp) |
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ohci_writel (ohci, temp, &ohci->regs->cmdstatus); |
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(void) ohci_readl (ohci, &ohci->regs->control); |
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} |
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ohci->rh_state = OHCI_RH_RUNNING; |
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return 0; |
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} |
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static int ohci_bus_suspend (struct usb_hcd *hcd) |
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{ |
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struct ohci_hcd *ohci = hcd_to_ohci (hcd); |
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int rc; |
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spin_lock_irq (&ohci->lock); |
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if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) |
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rc = -ESHUTDOWN; |
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else |
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rc = ohci_rh_suspend (ohci, 0); |
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spin_unlock_irq (&ohci->lock); |
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if (rc == 0) { |
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del_timer_sync(&ohci->io_watchdog); |
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ohci->prev_frame_no = IO_WATCHDOG_OFF; |
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} |
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return rc; |
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} |
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static int ohci_bus_resume (struct usb_hcd *hcd) |
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{ |
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struct ohci_hcd *ohci = hcd_to_ohci (hcd); |
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int rc; |
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if (time_before (jiffies, ohci->next_statechange)) |
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msleep(5); |
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spin_lock_irq (&ohci->lock); |
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if (unlikely(!HCD_HW_ACCESSIBLE(hcd))) |
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rc = -ESHUTDOWN; |
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else |
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rc = ohci_rh_resume (ohci); |
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spin_unlock_irq (&ohci->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 ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, |
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int any_connected, int rhsc_status) |
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{ |
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int poll_rh = 1; |
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int rhsc_enable; |
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|
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/* Some broken controllers never turn off RHSC in the interrupt |
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* status register. For their sake we won't re-enable RHSC |
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* interrupts if the interrupt bit is already active. |
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*/ |
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rhsc_enable = ohci_readl(ohci, &ohci->regs->intrenable) & |
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OHCI_INTR_RHSC; |
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switch (ohci->hc_control & OHCI_CTRL_HCFS) { |
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case OHCI_USB_OPER: |
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/* If no status changes are pending, enable RHSC interrupts. */ |
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if (!rhsc_enable && !rhsc_status && !changed) { |
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rhsc_enable = OHCI_INTR_RHSC; |
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ohci_writel(ohci, rhsc_enable, &ohci->regs->intrenable); |
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} |
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/* Keep on polling until we know a device is connected |
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* and RHSC is enabled, or until we autostop. |
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*/ |
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if (!ohci->autostop) { |
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if (any_connected || |
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!device_may_wakeup(&ohci_to_hcd(ohci) |
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->self.root_hub->dev)) { |
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if (rhsc_enable) |
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poll_rh = 0; |
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} else { |
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ohci->autostop = 1; |
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ohci->next_statechange = jiffies + HZ; |
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} |
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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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ohci->autostop = 0; |
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ohci->next_statechange = jiffies + |
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STATECHANGE_DELAY; |
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} else if (time_after_eq(jiffies, |
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ohci->next_statechange) |
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&& !ohci->ed_rm_list |
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&& !(ohci->hc_control & |
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OHCI_SCHED_ENABLES)) { |
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ohci_rh_suspend(ohci, 1); |
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if (rhsc_enable) |
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poll_rh = 0; |
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} |
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} |
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break; |
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case OHCI_USB_SUSPEND: |
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case OHCI_USB_RESUME: |
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/* if there is a port change, autostart or ask to be resumed */ |
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if (changed) { |
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if (ohci->autostop) |
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ohci_rh_resume(ohci); |
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else |
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usb_hcd_resume_root_hub(ohci_to_hcd(ohci)); |
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|
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/* If remote wakeup is disabled, stop polling */ |
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} else if (!ohci->autostop && |
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!ohci_to_hcd(ohci)->self.root_hub-> |
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do_remote_wakeup) { |
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poll_rh = 0; |
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|
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} else { |
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/* If no status changes are pending, |
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* enable RHSC interrupts |
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*/ |
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if (!rhsc_enable && !rhsc_status) { |
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rhsc_enable = OHCI_INTR_RHSC; |
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ohci_writel(ohci, rhsc_enable, |
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&ohci->regs->intrenable); |
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} |
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/* Keep polling until RHSC is enabled */ |
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if (rhsc_enable) |
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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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#else /* CONFIG_PM */ |
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|
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static inline int ohci_rh_resume(struct ohci_hcd *ohci) |
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{ |
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return 0; |
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} |
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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 ohci_root_hub_state_changes(struct ohci_hcd *ohci, int changed, |
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int any_connected, int rhsc_status) |
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{ |
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/* If RHSC is enabled, don't poll */ |
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if (ohci_readl(ohci, &ohci->regs->intrenable) & OHCI_INTR_RHSC) |
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return 0; |
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|
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/* If status changes are pending, continue polling. |
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* Conversely, if no status changes are pending but the RHSC |
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* status bit was set, then RHSC may be broken so continue polling. |
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*/ |
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if (changed || rhsc_status) |
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return 1; |
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|
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/* It's safe to re-enable RHSC interrupts */ |
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ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrenable); |
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return 0; |
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} |
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|
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#endif /* CONFIG_PM */ |
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|
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/*-------------------------------------------------------------------------*/ |
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|
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/* build "status change" packet (one or two bytes) from HC registers */ |
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|
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int ohci_hub_status_data(struct usb_hcd *hcd, char *buf) |
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{ |
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struct ohci_hcd *ohci = hcd_to_ohci (hcd); |
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int i, changed = 0, length = 1; |
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int any_connected = 0; |
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int rhsc_status; |
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unsigned long flags; |
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spin_lock_irqsave (&ohci->lock, flags); |
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if (!HCD_HW_ACCESSIBLE(hcd)) |
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goto done; |
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|
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/* undocumented erratum seen on at least rev D */ |
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if ((ohci->flags & OHCI_QUIRK_AMD756) |
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&& (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) { |
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ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n", |
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ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP); |
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/* retry later; "should not happen" */ |
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goto done; |
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} |
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|
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/* init status */ |
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if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC)) |
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buf [0] = changed = 1; |
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else |
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buf [0] = 0; |
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if (ohci->num_ports > 7) { |
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buf [1] = 0; |
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length++; |
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} |
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|
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/* Clear the RHSC status flag before reading the port statuses */ |
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ohci_writel(ohci, OHCI_INTR_RHSC, &ohci->regs->intrstatus); |
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rhsc_status = ohci_readl(ohci, &ohci->regs->intrstatus) & |
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OHCI_INTR_RHSC; |
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|
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/* look at each port */ |
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for (i = 0; i < ohci->num_ports; i++) { |
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u32 status = roothub_portstatus (ohci, i); |
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|
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/* can't autostop if ports are connected */ |
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any_connected |= (status & RH_PS_CCS); |
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|
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if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC |
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| RH_PS_OCIC | RH_PS_PRSC)) { |
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changed = 1; |
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if (i < 7) |
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buf [0] |= 1 << (i + 1); |
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else |
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buf [1] |= 1 << (i - 7); |
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} |
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} |
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|
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if (ohci_root_hub_state_changes(ohci, changed, |
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any_connected, rhsc_status)) |
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set_bit(HCD_FLAG_POLL_RH, &hcd->flags); |
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else |
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clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); |
|
|
|
|
|
done: |
|
spin_unlock_irqrestore (&ohci->lock, flags); |
|
|
|
return changed ? length : 0; |
|
} |
|
EXPORT_SYMBOL_GPL(ohci_hub_status_data); |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
static void |
|
ohci_hub_descriptor ( |
|
struct ohci_hcd *ohci, |
|
struct usb_hub_descriptor *desc |
|
) { |
|
u32 rh = roothub_a (ohci); |
|
u16 temp; |
|
|
|
desc->bDescriptorType = USB_DT_HUB; |
|
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 = HUB_CHAR_COMMON_LPSM | HUB_CHAR_COMMON_OCPM; |
|
if (rh & RH_A_NPS) /* no power switching? */ |
|
temp |= HUB_CHAR_NO_LPSM; |
|
if (rh & RH_A_PSM) /* per-port power switching? */ |
|
temp |= HUB_CHAR_INDV_PORT_LPSM; |
|
if (rh & RH_A_NOCP) /* no overcurrent reporting? */ |
|
temp |= HUB_CHAR_NO_OCPM; |
|
else if (rh & RH_A_OCPM) /* per-port overcurrent reporting? */ |
|
temp |= HUB_CHAR_INDV_PORT_OCPM; |
|
desc->wHubCharacteristics = cpu_to_le16(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; |
|
|
|
/* hub_wq 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. |
|
*/ |
|
#define PORT_RESET_MSEC 50 |
|
|
|
/* 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 hub_wq */ |
|
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; |
|
} |
|
|
|
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); |
|
break; |
|
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); |
|
|
|
if (*(u16*)(buf+2)) /* only if wPortChange is interesting */ |
|
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; |
|
} |
|
EXPORT_SYMBOL_GPL(ohci_hub_control);
|
|
|