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linux/drivers/usb/host/ehci-pci.c

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/*
* EHCI HCD (Host Controller Driver) PCI Bus Glue.
*
* 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
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef CONFIG_PCI
#error "This file is PCI bus glue. CONFIG_PCI must be defined."
#endif
/*-------------------------------------------------------------------------*/
/* called after powerup, by probe or system-pm "wakeup" */
static int ehci_pci_reinit(struct ehci_hcd *ehci, struct pci_dev *pdev)
{
u32 temp;
int retval;
/* optional debug port, normally in the first BAR */
temp = pci_find_capability(pdev, 0x0a);
if (temp) {
pci_read_config_dword(pdev, temp, &temp);
temp >>= 16;
if ((temp & (3 << 13)) == (1 << 13)) {
temp &= 0x1fff;
ehci->debug = ehci_to_hcd(ehci)->regs + temp;
temp = ehci_readl(ehci, &ehci->debug->control);
ehci_info(ehci, "debug port %d%s\n",
HCS_DEBUG_PORT(ehci->hcs_params),
(temp & DBGP_ENABLED)
? " IN USE"
: "");
if (!(temp & DBGP_ENABLED))
ehci->debug = NULL;
}
}
/* we expect static quirk code to handle the "extended capabilities"
* (currently just BIOS handoff) allowed starting with EHCI 0.96
*/
/* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
retval = pci_set_mwi(pdev);
if (!retval)
ehci_dbg(ehci, "MWI active\n");
return 0;
}
/* called during probe() after chip reset completes */
static int ehci_pci_setup(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
u32 temp;
int retval;
switch (pdev->vendor) {
case PCI_VENDOR_ID_TOSHIBA_2:
/* celleb's companion chip */
if (pdev->device == 0x01b5) {
#ifdef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
ehci->big_endian_mmio = 1;
#else
ehci_warn(ehci,
"unsupported big endian Toshiba quirk\n");
#endif
}
break;
}
ehci->caps = hcd->regs;
ehci->regs = hcd->regs +
HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
dbg_hcs_params(ehci, "reset");
dbg_hcc_params(ehci, "reset");
/* ehci_init() causes memory for DMA transfers to be
* allocated. Thus, any vendor-specific workarounds based on
* limiting the type of memory used for DMA transfers must
* happen before ehci_init() is called. */
switch (pdev->vendor) {
case PCI_VENDOR_ID_NVIDIA:
/* NVidia reports that certain chips don't handle
* QH, ITD, or SITD addresses above 2GB. (But TD,
* data buffer, and periodic schedule are normal.)
*/
switch (pdev->device) {
case 0x003c: /* MCP04 */
case 0x005b: /* CK804 */
case 0x00d8: /* CK8 */
case 0x00e8: /* CK8S */
if (pci_set_consistent_dma_mask(pdev,
DMA_31BIT_MASK) < 0)
ehci_warn(ehci, "can't enable NVidia "
"workaround for >2GB RAM\n");
break;
}
break;
}
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
retval = ehci_halt(ehci);
if (retval)
return retval;
/* data structure init */
retval = ehci_init(hcd);
if (retval)
return retval;
switch (pdev->vendor) {
case PCI_VENDOR_ID_TDI:
if (pdev->device == PCI_DEVICE_ID_TDI_EHCI) {
ehci->is_tdi_rh_tt = 1;
hcd->has_tt = 1;
tdi_reset(ehci);
}
break;
case PCI_VENDOR_ID_AMD:
/* AMD8111 EHCI doesn't work, according to AMD errata */
if (pdev->device == 0x7463) {
ehci_info(ehci, "ignoring AMD8111 (errata)\n");
retval = -EIO;
goto done;
}
break;
case PCI_VENDOR_ID_NVIDIA:
switch (pdev->device) {
/* Some NForce2 chips have problems with selective suspend;
* fixed in newer silicon.
*/
case 0x0068:
if (pdev->revision < 0xa4)
ehci->no_selective_suspend = 1;
break;
}
break;
case PCI_VENDOR_ID_VIA:
if (pdev->device == 0x3104 && (pdev->revision & 0xf0) == 0x60) {
u8 tmp;
/* The VT6212 defaults to a 1 usec EHCI sleep time which
* hogs the PCI bus *badly*. Setting bit 5 of 0x4B makes
* that sleep time use the conventional 10 usec.
*/
pci_read_config_byte(pdev, 0x4b, &tmp);
if (tmp & 0x20)
break;
pci_write_config_byte(pdev, 0x4b, tmp | 0x20);
}
break;
}
ehci_reset(ehci);
/* at least the Genesys GL880S needs fixup here */
temp = HCS_N_CC(ehci->hcs_params) * HCS_N_PCC(ehci->hcs_params);
temp &= 0x0f;
if (temp && HCS_N_PORTS(ehci->hcs_params) > temp) {
ehci_dbg(ehci, "bogus port configuration: "
"cc=%d x pcc=%d < ports=%d\n",
HCS_N_CC(ehci->hcs_params),
HCS_N_PCC(ehci->hcs_params),
HCS_N_PORTS(ehci->hcs_params));
switch (pdev->vendor) {
case 0x17a0: /* GENESYS */
/* GL880S: should be PORTS=2 */
temp |= (ehci->hcs_params & ~0xf);
ehci->hcs_params = temp;
break;
case PCI_VENDOR_ID_NVIDIA:
/* NF4: should be PCC=10 */
break;
}
}
/* Serial Bus Release Number is at PCI 0x60 offset */
pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
/* Workaround current PCI init glitch: wakeup bits aren't
* being set from PCI PM capability.
*/
if (!device_can_wakeup(&pdev->dev)) {
u16 port_wake;
pci_read_config_word(pdev, 0x62, &port_wake);
if (port_wake & 0x0001)
device_init_wakeup(&pdev->dev, 1);
}
#ifdef CONFIG_USB_SUSPEND
/* REVISIT: the controller works fine for wakeup iff the root hub
* itself is "globally" suspended, but usbcore currently doesn't
* understand such things.
*
* System suspend currently expects to be able to suspend the entire
* device tree, device-at-a-time. If we failed selective suspend
* reports, system suspend would fail; so the root hub code must claim
* success. That's lying to usbcore, and it matters for for runtime
* PM scenarios with selective suspend and remote wakeup...
*/
if (ehci->no_selective_suspend && device_can_wakeup(&pdev->dev))
ehci_warn(ehci, "selective suspend/wakeup unavailable\n");
#endif
ehci_port_power(ehci, 1);
retval = ehci_pci_reinit(ehci, pdev);
done:
return retval;
}
/*-------------------------------------------------------------------------*/
#ifdef CONFIG_PM
/* suspend/resume, section 4.3 */
/* These routines rely on the PCI bus glue
* to handle powerdown and wakeup, and currently also on
* transceivers that don't need any software attention to set up
* the right sort of wakeup.
* Also they depend on separate root hub suspend/resume.
*/
static int ehci_pci_suspend(struct usb_hcd *hcd, pm_message_t message)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
unsigned long flags;
int rc = 0;
if (time_before(jiffies, ehci->next_statechange))
msleep(10);
/* Root hub was already suspended. Disable irq emission and
* mark HW unaccessible, bail out if RH has been resumed. Use
* the spinlock to properly synchronize with possible pending
* RH suspend or resume activity.
*
* This is still racy as hcd->state is manipulated outside of
* any locks =P But that will be a different fix.
*/
spin_lock_irqsave (&ehci->lock, flags);
if (hcd->state != HC_STATE_SUSPENDED) {
rc = -EINVAL;
goto bail;
}
ehci_writel(ehci, 0, &ehci->regs->intr_enable);
(void)ehci_readl(ehci, &ehci->regs->intr_enable);
/* make sure snapshot being resumed re-enumerates everything */
if (message.event == PM_EVENT_PRETHAW) {
ehci_halt(ehci);
ehci_reset(ehci);
}
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
bail:
spin_unlock_irqrestore (&ehci->lock, flags);
// could save FLADJ in case of Vaux power loss
// ... we'd only use it to handle clock skew
return rc;
}
static int ehci_pci_resume(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
struct pci_dev *pdev = to_pci_dev(hcd->self.controller);
// maybe restore FLADJ
if (time_before(jiffies, ehci->next_statechange))
msleep(100);
/* Mark hardware accessible again as we are out of D3 state by now */
set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
/* If CF is still set, we maintained PCI Vaux power.
* Just undo the effect of ehci_pci_suspend().
*/
if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
int mask = INTR_MASK;
if (!hcd->self.root_hub->do_remote_wakeup)
mask &= ~STS_PCD;
ehci_writel(ehci, mask, &ehci->regs->intr_enable);
ehci_readl(ehci, &ehci->regs->intr_enable);
return 0;
}
ehci_dbg(ehci, "lost power, restarting\n");
usb_root_hub_lost_power(hcd->self.root_hub);
/* Else reset, to cope with power loss or flush-to-storage
* style "resume" having let BIOS kick in during reboot.
*/
(void) ehci_halt(ehci);
(void) ehci_reset(ehci);
(void) ehci_pci_reinit(ehci, pdev);
/* emptying the schedule aborts any urbs */
spin_lock_irq(&ehci->lock);
if (ehci->reclaim)
end_unlink_async(ehci);
ehci_work(ehci);
spin_unlock_irq(&ehci->lock);
ehci_writel(ehci, ehci->command, &ehci->regs->command);
ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
/* here we "know" root ports should always stay powered */
ehci_port_power(ehci, 1);
hcd->state = HC_STATE_SUSPENDED;
return 0;
}
#endif
static const struct hc_driver ehci_pci_hc_driver = {
.description = hcd_name,
.product_desc = "EHCI Host Controller",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* generic hardware linkage
*/
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
/*
* basic lifecycle operations
*/
.reset = ehci_pci_setup,
.start = ehci_run,
#ifdef CONFIG_PM
.pci_suspend = ehci_pci_suspend,
.pci_resume = ehci_pci_resume,
#endif
.stop = ehci_stop,
.shutdown = ehci_shutdown,
/*
* managing i/o requests and associated device resources
*/
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
/*
* scheduling support
*/
.get_frame_number = ehci_get_frame,
/*
* root hub support
*/
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,
.bus_suspend = ehci_bus_suspend,
.bus_resume = ehci_bus_resume,
.relinquish_port = ehci_relinquish_port,
};
/*-------------------------------------------------------------------------*/
/* PCI driver selection metadata; PCI hotplugging uses this */
static const struct pci_device_id pci_ids [] = { {
/* handle any USB 2.0 EHCI controller */
PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_EHCI, ~0),
.driver_data = (unsigned long) &ehci_pci_hc_driver,
},
{ /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE(pci, pci_ids);
/* pci driver glue; this is a "new style" PCI driver module */
static struct pci_driver ehci_pci_driver = {
.name = (char *) hcd_name,
.id_table = pci_ids,
.probe = usb_hcd_pci_probe,
.remove = usb_hcd_pci_remove,
#ifdef CONFIG_PM
.suspend = usb_hcd_pci_suspend,
.resume = usb_hcd_pci_resume,
#endif
.shutdown = usb_hcd_pci_shutdown,
};
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