26f953fd88
This revamps handling of the hardware "async advance" IRQ, and its watchdog timer. Basically it dis-entangles that important timeout from the others, simplifying the associated state and code to make it more robust. This reportedly improves behavior of EHCI on some systems with VIA chips, and AFAIK won't affect non-VIA hardware. VIA systems need this code to recover from silcon bugs whereby the "async advance" IRQ isn't issued. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
575 lines
15 KiB
C
575 lines
15 KiB
C
/*
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* Copyright (C) 2001-2004 by David Brownell
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* this file is part of ehci-hcd.c */
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/*-------------------------------------------------------------------------*/
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/*
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* EHCI Root Hub ... the nonsharable stuff
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*
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* Registers don't need cpu_to_le32, that happens transparently
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*/
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/*-------------------------------------------------------------------------*/
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#ifdef CONFIG_PM
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static int ehci_bus_suspend (struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci (hcd);
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int port;
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if (time_before (jiffies, ehci->next_statechange))
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msleep(5);
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port = HCS_N_PORTS (ehci->hcs_params);
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spin_lock_irq (&ehci->lock);
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/* stop schedules, clean any completed work */
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if (HC_IS_RUNNING(hcd->state)) {
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ehci_quiesce (ehci);
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hcd->state = HC_STATE_QUIESCING;
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}
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ehci->command = readl (&ehci->regs->command);
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if (ehci->reclaim)
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end_unlink_async (ehci, NULL);
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ehci_work(ehci, NULL);
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/* suspend any active/unsuspended ports, maybe allow wakeup */
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while (port--) {
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u32 __iomem *reg = &ehci->regs->port_status [port];
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u32 t1 = readl (reg) & ~PORT_RWC_BITS;
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u32 t2 = t1;
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if ((t1 & PORT_PE) && !(t1 & PORT_OWNER))
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t2 |= PORT_SUSPEND;
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if (device_may_wakeup(&hcd->self.root_hub->dev))
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t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
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else
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t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
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if (t1 != t2) {
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ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
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port + 1, t1, t2);
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writel (t2, reg);
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}
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}
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/* turn off now-idle HC */
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del_timer_sync (&ehci->watchdog);
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ehci_halt (ehci);
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hcd->state = HC_STATE_SUSPENDED;
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ehci->next_statechange = jiffies + msecs_to_jiffies(10);
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spin_unlock_irq (&ehci->lock);
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return 0;
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}
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/* caller has locked the root hub, and should reset/reinit on error */
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static int ehci_bus_resume (struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci (hcd);
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u32 temp;
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int i;
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int intr_enable;
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if (time_before (jiffies, ehci->next_statechange))
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msleep(5);
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spin_lock_irq (&ehci->lock);
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/* Ideally and we've got a real resume here, and no port's power
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* was lost. (For PCI, that means Vaux was maintained.) But we
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* could instead be restoring a swsusp snapshot -- so that BIOS was
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* the last user of the controller, not reset/pm hardware keeping
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* state we gave to it.
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*/
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/* re-init operational registers in case we lost power */
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if (readl (&ehci->regs->intr_enable) == 0) {
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/* at least some APM implementations will try to deliver
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* IRQs right away, so delay them until we're ready.
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*/
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intr_enable = 1;
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writel (0, &ehci->regs->segment);
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writel (ehci->periodic_dma, &ehci->regs->frame_list);
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writel ((u32)ehci->async->qh_dma, &ehci->regs->async_next);
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} else
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intr_enable = 0;
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ehci_dbg(ehci, "resume root hub%s\n",
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intr_enable ? " after power loss" : "");
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/* restore CMD_RUN, framelist size, and irq threshold */
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writel (ehci->command, &ehci->regs->command);
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/* take ports out of suspend */
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i = HCS_N_PORTS (ehci->hcs_params);
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while (i--) {
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temp = readl (&ehci->regs->port_status [i]);
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temp &= ~(PORT_RWC_BITS
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| PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
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if (temp & PORT_SUSPEND) {
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ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
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temp |= PORT_RESUME;
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}
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writel (temp, &ehci->regs->port_status [i]);
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}
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i = HCS_N_PORTS (ehci->hcs_params);
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mdelay (20);
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while (i--) {
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temp = readl (&ehci->regs->port_status [i]);
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if ((temp & PORT_SUSPEND) == 0)
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continue;
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temp &= ~(PORT_RWC_BITS | PORT_RESUME);
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writel (temp, &ehci->regs->port_status [i]);
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ehci_vdbg (ehci, "resumed port %d\n", i + 1);
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}
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(void) readl (&ehci->regs->command);
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/* maybe re-activate the schedule(s) */
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temp = 0;
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if (ehci->async->qh_next.qh)
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temp |= CMD_ASE;
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if (ehci->periodic_sched)
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temp |= CMD_PSE;
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if (temp) {
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ehci->command |= temp;
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writel (ehci->command, &ehci->regs->command);
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}
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ehci->next_statechange = jiffies + msecs_to_jiffies(5);
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hcd->state = HC_STATE_RUNNING;
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/* Now we can safely re-enable irqs */
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if (intr_enable)
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writel (INTR_MASK, &ehci->regs->intr_enable);
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spin_unlock_irq (&ehci->lock);
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return 0;
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}
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#else
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#define ehci_bus_suspend NULL
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#define ehci_bus_resume NULL
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#endif /* CONFIG_PM */
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/*-------------------------------------------------------------------------*/
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static int check_reset_complete (
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struct ehci_hcd *ehci,
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int index,
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int port_status
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) {
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if (!(port_status & PORT_CONNECT)) {
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ehci->reset_done [index] = 0;
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return port_status;
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}
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/* if reset finished and it's still not enabled -- handoff */
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if (!(port_status & PORT_PE)) {
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/* with integrated TT, there's nobody to hand it to! */
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if (ehci_is_TDI(ehci)) {
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ehci_dbg (ehci,
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"Failed to enable port %d on root hub TT\n",
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index+1);
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return port_status;
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}
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ehci_dbg (ehci, "port %d full speed --> companion\n",
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index + 1);
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// what happens if HCS_N_CC(params) == 0 ?
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port_status |= PORT_OWNER;
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port_status &= ~PORT_RWC_BITS;
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writel (port_status, &ehci->regs->port_status [index]);
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} else
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ehci_dbg (ehci, "port %d high speed\n", index + 1);
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return port_status;
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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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static int
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ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
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{
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struct ehci_hcd *ehci = hcd_to_ehci (hcd);
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u32 temp, status = 0;
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int ports, i, retval = 1;
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unsigned long flags;
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/* if !USB_SUSPEND, root hub timers won't get shut down ... */
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if (!HC_IS_RUNNING(hcd->state))
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return 0;
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/* init status to no-changes */
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buf [0] = 0;
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ports = HCS_N_PORTS (ehci->hcs_params);
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if (ports > 7) {
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buf [1] = 0;
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retval++;
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}
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/* no hub change reports (bit 0) for now (power, ...) */
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/* port N changes (bit N)? */
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spin_lock_irqsave (&ehci->lock, flags);
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for (i = 0; i < ports; i++) {
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temp = readl (&ehci->regs->port_status [i]);
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if (temp & PORT_OWNER) {
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/* don't report this in GetPortStatus */
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if (temp & PORT_CSC) {
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temp &= ~PORT_RWC_BITS;
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temp |= PORT_CSC;
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writel (temp, &ehci->regs->port_status [i]);
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}
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continue;
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}
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if (!(temp & PORT_CONNECT))
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ehci->reset_done [i] = 0;
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if ((temp & (PORT_CSC | PORT_PEC | PORT_OCC)) != 0
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// PORT_STAT_C_SUSPEND?
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|| ((temp & PORT_RESUME) != 0
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&& time_after (jiffies,
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ehci->reset_done [i]))) {
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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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status = STS_PCD;
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}
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}
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/* FIXME autosuspend idle root hubs */
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spin_unlock_irqrestore (&ehci->lock, flags);
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return status ? retval : 0;
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}
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/*-------------------------------------------------------------------------*/
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static void
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ehci_hub_descriptor (
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struct ehci_hcd *ehci,
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struct usb_hub_descriptor *desc
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) {
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int ports = HCS_N_PORTS (ehci->hcs_params);
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u16 temp;
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desc->bDescriptorType = 0x29;
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desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
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desc->bHubContrCurrent = 0;
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desc->bNbrPorts = ports;
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temp = 1 + (ports / 8);
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desc->bDescLength = 7 + 2 * temp;
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/* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
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memset (&desc->bitmap [0], 0, temp);
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memset (&desc->bitmap [temp], 0xff, temp);
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temp = 0x0008; /* per-port overcurrent reporting */
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if (HCS_PPC (ehci->hcs_params))
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temp |= 0x0001; /* per-port power control */
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else
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temp |= 0x0002; /* no power switching */
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#if 0
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// re-enable when we support USB_PORT_FEAT_INDICATOR below.
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if (HCS_INDICATOR (ehci->hcs_params))
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temp |= 0x0080; /* per-port indicators (LEDs) */
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#endif
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desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
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}
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/*-------------------------------------------------------------------------*/
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#define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
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static int ehci_hub_control (
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struct usb_hcd *hcd,
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u16 typeReq,
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u16 wValue,
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u16 wIndex,
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char *buf,
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u16 wLength
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) {
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struct ehci_hcd *ehci = hcd_to_ehci (hcd);
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int ports = HCS_N_PORTS (ehci->hcs_params);
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u32 temp, status;
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unsigned long flags;
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int retval = 0;
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/*
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* FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
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* HCS_INDICATOR may say we can change LEDs to off/amber/green.
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* (track current state ourselves) ... blink for diagnostics,
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* power, "this is the one", etc. EHCI spec supports this.
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*/
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spin_lock_irqsave (&ehci->lock, flags);
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switch (typeReq) {
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case ClearHubFeature:
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switch (wValue) {
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case C_HUB_LOCAL_POWER:
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case C_HUB_OVER_CURRENT:
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/* no hub-wide feature/status flags */
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break;
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default:
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goto error;
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}
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break;
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case ClearPortFeature:
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if (!wIndex || wIndex > ports)
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goto error;
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wIndex--;
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temp = readl (&ehci->regs->port_status [wIndex]);
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if (temp & PORT_OWNER)
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break;
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switch (wValue) {
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case USB_PORT_FEAT_ENABLE:
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writel (temp & ~PORT_PE,
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&ehci->regs->port_status [wIndex]);
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break;
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case USB_PORT_FEAT_C_ENABLE:
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writel((temp & ~PORT_RWC_BITS) | PORT_PEC,
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&ehci->regs->port_status [wIndex]);
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break;
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case USB_PORT_FEAT_SUSPEND:
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if (temp & PORT_RESET)
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goto error;
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if (ehci->no_selective_suspend)
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break;
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if (temp & PORT_SUSPEND) {
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if ((temp & PORT_PE) == 0)
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goto error;
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/* resume signaling for 20 msec */
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temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
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writel (temp | PORT_RESUME,
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&ehci->regs->port_status [wIndex]);
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ehci->reset_done [wIndex] = jiffies
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+ msecs_to_jiffies (20);
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}
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break;
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case USB_PORT_FEAT_C_SUSPEND:
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/* we auto-clear this feature */
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break;
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case USB_PORT_FEAT_POWER:
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if (HCS_PPC (ehci->hcs_params))
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writel (temp & ~(PORT_RWC_BITS | PORT_POWER),
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&ehci->regs->port_status [wIndex]);
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break;
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case USB_PORT_FEAT_C_CONNECTION:
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writel((temp & ~PORT_RWC_BITS) | PORT_CSC,
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&ehci->regs->port_status [wIndex]);
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break;
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case USB_PORT_FEAT_C_OVER_CURRENT:
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writel((temp & ~PORT_RWC_BITS) | PORT_OCC,
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&ehci->regs->port_status [wIndex]);
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break;
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case USB_PORT_FEAT_C_RESET:
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/* GetPortStatus clears reset */
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break;
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default:
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goto error;
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}
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readl (&ehci->regs->command); /* unblock posted write */
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break;
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case GetHubDescriptor:
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ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
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buf);
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break;
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case GetHubStatus:
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/* no hub-wide feature/status flags */
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memset (buf, 0, 4);
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//cpu_to_le32s ((u32 *) buf);
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break;
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case GetPortStatus:
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if (!wIndex || wIndex > ports)
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goto error;
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wIndex--;
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status = 0;
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temp = readl (&ehci->regs->port_status [wIndex]);
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// wPortChange bits
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if (temp & PORT_CSC)
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status |= 1 << USB_PORT_FEAT_C_CONNECTION;
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if (temp & PORT_PEC)
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status |= 1 << USB_PORT_FEAT_C_ENABLE;
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if (temp & PORT_OCC)
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status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
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/* whoever resumes must GetPortStatus to complete it!! */
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if ((temp & PORT_RESUME)
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&& time_after (jiffies,
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ehci->reset_done [wIndex])) {
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status |= 1 << USB_PORT_FEAT_C_SUSPEND;
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ehci->reset_done [wIndex] = 0;
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/* stop resume signaling */
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temp = readl (&ehci->regs->port_status [wIndex]);
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writel (temp & ~(PORT_RWC_BITS | PORT_RESUME),
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&ehci->regs->port_status [wIndex]);
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retval = handshake (
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&ehci->regs->port_status [wIndex],
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PORT_RESUME, 0, 2000 /* 2msec */);
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if (retval != 0) {
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ehci_err (ehci, "port %d resume error %d\n",
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wIndex + 1, retval);
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goto error;
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}
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temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
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}
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/* whoever resets must GetPortStatus to complete it!! */
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if ((temp & PORT_RESET)
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&& time_after (jiffies,
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ehci->reset_done [wIndex])) {
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status |= 1 << USB_PORT_FEAT_C_RESET;
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ehci->reset_done [wIndex] = 0;
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/* force reset to complete */
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writel (temp & ~(PORT_RWC_BITS | PORT_RESET),
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&ehci->regs->port_status [wIndex]);
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/* REVISIT: some hardware needs 550+ usec to clear
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* this bit; seems too long to spin routinely...
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*/
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retval = handshake (
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&ehci->regs->port_status [wIndex],
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PORT_RESET, 0, 750);
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if (retval != 0) {
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ehci_err (ehci, "port %d reset error %d\n",
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wIndex + 1, retval);
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goto error;
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}
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/* see what we found out */
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temp = check_reset_complete (ehci, wIndex,
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readl (&ehci->regs->port_status [wIndex]));
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}
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// don't show wPortStatus if it's owned by a companion hc
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if (!(temp & PORT_OWNER)) {
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if (temp & PORT_CONNECT) {
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status |= 1 << USB_PORT_FEAT_CONNECTION;
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// status may be from integrated TT
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status |= ehci_port_speed(ehci, temp);
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}
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if (temp & PORT_PE)
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status |= 1 << USB_PORT_FEAT_ENABLE;
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if (temp & (PORT_SUSPEND|PORT_RESUME))
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status |= 1 << USB_PORT_FEAT_SUSPEND;
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if (temp & PORT_OC)
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status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
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if (temp & PORT_RESET)
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status |= 1 << USB_PORT_FEAT_RESET;
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if (temp & PORT_POWER)
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status |= 1 << USB_PORT_FEAT_POWER;
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}
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#ifndef EHCI_VERBOSE_DEBUG
|
|
if (status & ~0xffff) /* only if wPortChange is interesting */
|
|
#endif
|
|
dbg_port (ehci, "GetStatus", wIndex + 1, temp);
|
|
// we "know" this alignment is good, caller used kmalloc()...
|
|
*((__le32 *) buf) = cpu_to_le32 (status);
|
|
break;
|
|
case SetHubFeature:
|
|
switch (wValue) {
|
|
case C_HUB_LOCAL_POWER:
|
|
case C_HUB_OVER_CURRENT:
|
|
/* no hub-wide feature/status flags */
|
|
break;
|
|
default:
|
|
goto error;
|
|
}
|
|
break;
|
|
case SetPortFeature:
|
|
if (!wIndex || wIndex > ports)
|
|
goto error;
|
|
wIndex--;
|
|
temp = readl (&ehci->regs->port_status [wIndex]);
|
|
if (temp & PORT_OWNER)
|
|
break;
|
|
|
|
temp &= ~PORT_RWC_BITS;
|
|
switch (wValue) {
|
|
case USB_PORT_FEAT_SUSPEND:
|
|
if (ehci->no_selective_suspend)
|
|
break;
|
|
if ((temp & PORT_PE) == 0
|
|
|| (temp & PORT_RESET) != 0)
|
|
goto error;
|
|
if (device_may_wakeup(&hcd->self.root_hub->dev))
|
|
temp |= PORT_WAKE_BITS;
|
|
writel (temp | PORT_SUSPEND,
|
|
&ehci->regs->port_status [wIndex]);
|
|
break;
|
|
case USB_PORT_FEAT_POWER:
|
|
if (HCS_PPC (ehci->hcs_params))
|
|
writel (temp | PORT_POWER,
|
|
&ehci->regs->port_status [wIndex]);
|
|
break;
|
|
case USB_PORT_FEAT_RESET:
|
|
if (temp & PORT_RESUME)
|
|
goto error;
|
|
/* line status bits may report this as low speed,
|
|
* which can be fine if this root hub has a
|
|
* transaction translator built in.
|
|
*/
|
|
if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
|
|
&& !ehci_is_TDI(ehci)
|
|
&& PORT_USB11 (temp)) {
|
|
ehci_dbg (ehci,
|
|
"port %d low speed --> companion\n",
|
|
wIndex + 1);
|
|
temp |= PORT_OWNER;
|
|
} else {
|
|
ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
|
|
temp |= PORT_RESET;
|
|
temp &= ~PORT_PE;
|
|
|
|
/*
|
|
* caller must wait, then call GetPortStatus
|
|
* usb 2.0 spec says 50 ms resets on root
|
|
*/
|
|
ehci->reset_done [wIndex] = jiffies
|
|
+ msecs_to_jiffies (50);
|
|
}
|
|
writel (temp, &ehci->regs->port_status [wIndex]);
|
|
break;
|
|
default:
|
|
goto error;
|
|
}
|
|
readl (&ehci->regs->command); /* unblock posted writes */
|
|
break;
|
|
|
|
default:
|
|
error:
|
|
/* "stall" on error */
|
|
retval = -EPIPE;
|
|
}
|
|
spin_unlock_irqrestore (&ehci->lock, flags);
|
|
return retval;
|
|
}
|