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20f588ac98
While going into S3 or S4 suspend, an OHCI host controller can generate interrupt requests if the INTR_SF enable flag is set. The interrupt handler routine isn't prepared for this and it doesn't turn off the flag, causing an interrupt storm. To fix this problem, make ohci_rh_suspend() always disable INTR_SF interrupts after processing the done list and the ED unlinks but before the controller goes into the suspended (non-UsbOperational) state. There's no reason to leave the flag enabled, since a suspended controller doesn't generate Start-of-Frame packets. Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn> Link: https://lore.kernel.org/r/1634095928-29639-1-git-send-email-zhuyinbo@loongson.cn Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
804 lines
21 KiB
C
804 lines
21 KiB
C
// 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 <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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/*-------------------------------------------------------------------------*/
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/*
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* OHCI Root Hub ... the nonsharable stuff
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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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/* 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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/* 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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/* All ED unlinks should be finished, no need for SOF interrupts */
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ohci_writel(ohci, OHCI_INTR_SF, &ohci->regs->intrdisable);
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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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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} 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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#else /* CONFIG_PM */
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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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/* 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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/* 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.
|
|
*/
|
|
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 */
|
|
|
|
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;
|
|
}
|
|
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);
|