/*
- * Copyright (c) 2000-2002 by David Brownell
+ * Copyright (c) 2000-2004 by David Brownell
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
*
* HISTORY:
*
+ * 2004-05-10 Root hub and PCI suspend/resume support; remote wakeup. (db)
* 2004-02-24 Replace pci_* with generic dma_* API calls (dsaxena@plexity.net)
* 2003-12-29 Rewritten high speed iso transfer support (by Michal Sojka,
* <sojkam@centrum.cz>, updates by DB).
* 2001-June Works with usb-storage and NEC EHCI on 2.4
*/
-#define DRIVER_VERSION "2003-Dec-29"
+#define DRIVER_VERSION "2004-May-10"
#define DRIVER_AUTHOR "David Brownell"
#define DRIVER_DESC "USB 2.0 'Enhanced' Host Controller (EHCI) Driver"
module_param (log2_irq_thresh, int, S_IRUGO);
MODULE_PARM_DESC (log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
-#define INTR_MASK (STS_IAA | STS_FATAL | STS_ERR | STS_INT)
+#define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
/*-------------------------------------------------------------------------*/
* before driver shutdown. But it also seems to be caused by bugs in cardbus
* bridge shutdown: shutting down the bridge before the devices using it.
*/
-static int handshake (u32 *ptr, u32 mask, u32 done, int usec)
+static int handshake (u32 __iomem *ptr, u32 mask, u32 done, int usec)
{
u32 result;
dbg_cmd (ehci, "reset", command);
writel (command, &ehci->regs->command);
ehci->hcd.state = USB_STATE_HALT;
+ ehci->next_statechange = jiffies;
return handshake (&ehci->regs->command, CMD_RESET, 0, 250 * 1000);
}
/*-------------------------------------------------------------------------*/
+static void ehci_work(struct ehci_hcd *ehci, struct pt_regs *regs);
+
#include "ehci-hub.c"
#include "ehci-mem.c"
#include "ehci-q.c"
/*-------------------------------------------------------------------------*/
-static void ehci_work(struct ehci_hcd *ehci, struct pt_regs *regs);
-
static void ehci_watchdog (unsigned long param)
{
struct ehci_hcd *ehci = (struct ehci_hcd *) param;
static int bios_handoff (struct ehci_hcd *ehci, int where, u32 cap)
{
if (cap & (1 << 16)) {
- int msec = 500;
+ int msec = 5000;
+ struct pci_dev *pdev = to_pci_dev(ehci->hcd.self.controller);
/* request handoff to OS */
- cap &= 1 << 24;
- pci_write_config_dword (to_pci_dev(ehci->hcd.self.controller), where, cap);
+ cap |= 1 << 24;
+ pci_write_config_dword(pdev, where, cap);
/* and wait a while for it to happen */
do {
- wait_ms (10);
+ msleep(10);
msec -= 10;
- pci_read_config_dword (to_pci_dev(ehci->hcd.self.controller), where, &cap);
+ pci_read_config_dword(pdev, where, &cap);
} while ((cap & (1 << 16)) && msec);
if (cap & (1 << 16)) {
ehci_err (ehci, "BIOS handoff failed (%d, %04x)\n",
where, cap);
- return 1;
+ // some BIOS versions seem buggy...
+ // return 1;
+ ehci_warn (ehci, "continuing after BIOS bug...\n");
+ return 0;
}
ehci_dbg (ehci, "BIOS handoff succeeded\n");
}
spin_lock_init (&ehci->lock);
- ehci->caps = (struct ehci_caps *) hcd->regs;
- ehci->regs = (struct ehci_regs *) (hcd->regs +
+ ehci->caps = hcd->regs;
+ ehci->regs = (hcd->regs +
HC_LENGTH (readl (&ehci->caps->hc_capbase)));
dbg_hcs_params (ehci, "reset");
dbg_hcc_params (ehci, "reset");
else // N microframes cached
ehci->i_thresh = 2 + HCC_ISOC_THRES (hcc_params);
- ehci->reclaim = 0;
+ ehci->reclaim = NULL;
ehci->next_uframe = -1;
/* controller state: unknown --> reset */
ehci_mem_cleanup (ehci);
return retval;
}
- writel (INTR_MASK, &ehci->regs->intr_enable);
writel (ehci->periodic_dma, &ehci->regs->frame_list);
#ifdef CONFIG_PCI
if (hcd->self.controller->bus == &pci_bus_type) {
struct pci_dev *pdev;
+ u16 port_wake;
pdev = to_pci_dev(hcd->self.controller);
/* Serial Bus Release Number is at PCI 0x60 offset */
pci_read_config_byte(pdev, 0x60, &sbrn);
+ /* port wake capability, reported by boot firmware */
+ pci_read_config_word(pdev, 0x62, &port_wake);
+ hcd->can_wakeup = (port_wake & 1) != 0;
+
/* help hc dma work well with cachelines */
pci_set_mwi (pdev);
* its dummy is used in hw_alt_next of many tds, to prevent the qh
* from automatically advancing to the next td after short reads.
*/
- ehci->async->qh_next.qh = 0;
+ ehci->async->qh_next.qh = NULL;
ehci->async->hw_next = QH_NEXT (ehci->async->qh_dma);
ehci->async->hw_info1 = cpu_to_le32 (QH_HEAD);
ehci->async->hw_token = cpu_to_le32 (QTD_STS_HALT);
/* wire up the root hub */
bus = hcd_to_bus (hcd);
- bus->root_hub = udev = usb_alloc_dev (NULL, bus, 0);
+ udev = usb_alloc_dev (NULL, bus, 0);
if (!udev) {
done2:
ehci_mem_cleanup (ehci);
/*
* Start, enabling full USB 2.0 functionality ... usb 1.1 devices
* are explicitly handed to companion controller(s), so no TT is
- * involved with the root hub.
+ * involved with the root hub. (Except where one is integrated,
+ * and there's no companion controller unless maybe for USB OTG.)
*/
ehci->reboot_notifier.notifier_call = ehci_reboot;
register_reboot_notifier (&ehci->reboot_notifier);
* and device drivers may start it running.
*/
udev->speed = USB_SPEED_HIGH;
- if (hcd_register_root (hcd) != 0) {
+ if (hcd_register_root (udev, hcd) != 0) {
if (hcd->state == USB_STATE_RUNNING)
ehci_ready (ehci);
ehci_reset (ehci);
- bus->root_hub = 0;
usb_put_dev (udev);
retval = -ENODEV;
goto done2;
}
+ writel (INTR_MASK, &ehci->regs->intr_enable); /* Turn On Interrupts */
+
create_debug_files (ehci);
return 0;
static void ehci_stop (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
+ u8 rh_ports, port;
ehci_dbg (ehci, "stop\n");
return;
}
del_timer_sync (&ehci->watchdog);
+
+ /* Turn off port power on all root hub ports. */
+ rh_ports = HCS_N_PORTS (ehci->hcs_params);
+ for (port = 1; port <= rh_ports; port++) {
+ ehci_hub_control(hcd, ClearPortFeature, USB_PORT_FEAT_POWER,
+ port, NULL, 0);
+ }
+
ehci_reset (ehci);
+ writel (0, &ehci->regs->intr_enable);
/* let companion controllers work when we aren't */
writel (0, &ehci->regs->configured_flag);
/* suspend/resume, section 4.3 */
+/* These routines rely on PCI to handle powerdown and wakeup, and
+ * transceivers that don't need any software attention to set up
+ * the right sort of wakeup.
+ */
+
static int ehci_suspend (struct usb_hcd *hcd, u32 state)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
- int ports;
- int i;
-
- ehci_dbg (ehci, "suspend to %d\n", state);
- ports = HCS_N_PORTS (ehci->hcs_params);
+ while (time_before (jiffies, ehci->next_statechange))
+ msleep (100);
- // FIXME: This assumes what's probably a D3 level suspend...
-
- // FIXME: usb wakeup events on this bus should resume the machine.
- // pci config register PORTWAKECAP controls which ports can do it;
- // bios may have initted the register...
-
- /* suspend each port, then stop the hc */
- for (i = 0; i < ports; i++) {
- int temp = readl (&ehci->regs->port_status [i]);
-
- if ((temp & PORT_PE) == 0
- || (temp & PORT_OWNER) != 0)
- continue;
- ehci_dbg (ehci, "suspend port %d", i);
- temp |= PORT_SUSPEND;
- writel (temp, &ehci->regs->port_status [i]);
- }
-
- if (hcd->state == USB_STATE_RUNNING)
- ehci_ready (ehci);
- writel (readl (&ehci->regs->command) & ~CMD_RUN, &ehci->regs->command);
-
-// save pci FLADJ value
+#ifdef CONFIG_USB_SUSPEND
+ (void) usb_suspend_device (hcd->self.root_hub, state);
+#else
+ /* FIXME lock root hub */
+ (void) ehci_hub_suspend (hcd);
+#endif
- /* who tells PCI to reduce power consumption? */
+ // save (PCI) FLADJ in case of Vaux power loss
return 0;
}
static int ehci_resume (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
- int ports;
- int i;
-
- ehci_dbg (ehci, "resume\n");
-
- ports = HCS_N_PORTS (ehci->hcs_params);
-
- // FIXME: if controller didn't retain state,
- // return and let generic code clean it up
- // test configured_flag ?
-
- /* resume HC and each port */
-// restore pci FLADJ value
- // khubd and drivers will set HC running, if needed;
- hcd->state = USB_STATE_RUNNING;
- // FIXME Philips/Intel/... etc don't really have a "READY"
- // state ... turn on CMD_RUN too
- for (i = 0; i < ports; i++) {
- int temp = readl (&ehci->regs->port_status [i]);
-
- if ((temp & PORT_PE) == 0
- || (temp & PORT_SUSPEND) != 0)
- continue;
- ehci_dbg (ehci, "resume port %d", i);
- temp |= PORT_RESUME;
- writel (temp, &ehci->regs->port_status [i]);
- readl (&ehci->regs->command); /* unblock posted writes */
-
- wait_ms (20);
- temp &= ~PORT_RESUME;
- writel (temp, &ehci->regs->port_status [i]);
- }
- readl (&ehci->regs->command); /* unblock posted writes */
- return 0;
+ int retval;
+
+ // maybe restore (PCI) FLADJ
+
+ while (time_before (jiffies, ehci->next_statechange))
+ msleep (100);
+
+#ifdef CONFIG_USB_SUSPEND
+ retval = usb_resume_device (hcd->self.root_hub);
+#else
+ /* FIXME lock root hub */
+ retval = ehci_hub_resume (hcd);
+#endif
+ if (retval == 0)
+ hcd->self.controller->power.power_state = 0;
+ return retval;
}
#endif
timer_action_done (ehci, TIMER_IO_WATCHDOG);
if (ehci->reclaim_ready)
end_unlink_async (ehci, regs);
+
+ /* another CPU may drop ehci->lock during a schedule scan while
+ * it reports urb completions. this flag guards against bogus
+ * attempts at re-entrant schedule scanning.
+ */
+ if (ehci->scanning)
+ return;
+ ehci->scanning = 1;
scan_async (ehci, regs);
if (ehci->next_uframe != -1)
scan_periodic (ehci, regs);
+ ehci->scanning = 0;
/* the IO watchdog guards against hardware or driver bugs that
* misplace IRQs, and should let us run completely without IRQs.
status = readl (&ehci->regs->status);
- /* shared irq */
- if (status == 0) {
- spin_unlock (&ehci->lock);
- return IRQ_NONE;
- }
-
/* e.g. cardbus physical eject */
if (status == ~(u32) 0) {
ehci_dbg (ehci, "device removed\n");
}
status &= INTR_MASK;
- if (!status) /* irq sharing? */
- goto done;
+ if (!status) { /* irq sharing? */
+ spin_unlock(&ehci->lock);
+ return IRQ_NONE;
+ }
/* clear (just) interrupts */
writel (status, &ehci->regs->status);
bh = 0;
#ifdef EHCI_VERBOSE_DEBUG
- /* unrequested/ignored: Port Change Detect, Frame List Rollover */
+ /* unrequested/ignored: Frame List Rollover */
dbg_status (ehci, "irq", status);
#endif
bh = 1;
}
+ /* remote wakeup [4.3.1] */
+ if ((status & STS_PCD) && ehci->hcd.remote_wakeup) {
+ unsigned i = HCS_N_PORTS (ehci->hcs_params);
+
+ /* resume root hub? */
+ status = readl (&ehci->regs->command);
+ if (!(status & CMD_RUN))
+ writel (status | CMD_RUN, &ehci->regs->command);
+
+ while (i--) {
+ status = readl (&ehci->regs->port_status [i]);
+ if (status & PORT_OWNER)
+ continue;
+ if (!(status & PORT_RESUME)
+ || ehci->reset_done [i] != 0)
+ continue;
+
+ /* start 20 msec resume signaling from this port,
+ * and make khubd collect PORT_STAT_C_SUSPEND to
+ * stop that signaling.
+ */
+ ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
+ mod_timer (&ehci->hcd.rh_timer,
+ ehci->reset_done [i] + 1);
+ ehci_dbg (ehci, "port %d remote wakeup\n", i + 1);
+ }
+ }
+
/* PCI errors [4.15.2.4] */
if (unlikely ((status & STS_FATAL) != 0)) {
ehci_err (ehci, "fatal error\n");
if (bh)
ehci_work (ehci, regs);
-done:
spin_unlock (&ehci->lock);
return IRQ_HANDLED;
}
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
struct list_head qtd_list;
- urb->transfer_flags &= ~EHCI_STATE_UNLINK;
INIT_LIST_HEAD (&qtd_list);
switch (usb_pipetype (urb->pipe)) {
// wait till next completion, do it then.
// completion irqs can wait up to 1024 msec,
- urb->transfer_flags |= EHCI_STATE_UNLINK;
break;
}
spin_unlock_irqrestore (&ehci->lock, flags);
goto rescan;
case QH_STATE_IDLE: /* fully unlinked */
if (list_empty (&qh->qtd_list)) {
- qh_put (ehci, qh);
+ qh_put (qh);
break;
}
/* else FALL THROUGH */
list_empty (&qh->qtd_list) ? "" : "(has tds)");
break;
}
- dev->ep [epnum] = 0;
+ dev->ep[epnum] = NULL;
done:
spin_unlock_irqrestore (&ehci->lock, flags);
return;
*/
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,
+ .hub_suspend = ehci_hub_suspend,
+ .hub_resume = ehci_hub_resume,
};
/*-------------------------------------------------------------------------*/
git://git.onelab.eu / linux-2.6.git / blobdiff