/*
* Initialize a controller that was newly discovered or has just been
* resumed. In either case we can't be sure of its previous state.
*/
static void check_and_reset_hc(struct uhci_hcd *uhci)
{
u16 legsup;
unsigned int cmd, intr;
/*
* When restarting a suspended controller, we expect all the
* settings to be the same as we left them:
*
* PIRQ and SMI disabled, no R/W bits set in USBLEGSUP;
* Controller is stopped and configured with EGSM set;
* No interrupts enabled except possibly Resume Detect.
*
* If any of these conditions are violated we do a complete reset.
*/
pci_read_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, &legsup);
if (legsup & ~(USBLEGSUP_RO | USBLEGSUP_RWC)) {
dev_dbg(uhci_dev(uhci), "%s: legsup = 0x%04x\n",
__FUNCTION__, legsup);
goto reset_needed;
}
cmd = inw(uhci->io_addr + USBCMD);
if ((cmd & USBCMD_RS) || !(cmd & USBCMD_CF) || !(cmd & USBCMD_EGSM)) {
dev_dbg(uhci_dev(uhci), "%s: cmd = 0x%04x\n",
__FUNCTION__, cmd);
goto reset_needed;
}
intr = inw(uhci->io_addr + USBINTR);
if (intr & (~USBINTR_RESUME)) {
dev_dbg(uhci_dev(uhci), "%s: intr = 0x%04x\n",
__FUNCTION__, intr);
goto reset_needed;
}
return;
reset_needed:
dev_dbg(uhci_dev(uhci), "Performing full reset\n");
reset_hc(uhci);
}
/*
* Last rites for a defunct/nonfunctional controller
* or one we don't want to use any more.
*/
static void hc_died(struct uhci_hcd *uhci)
{
reset_hc(uhci);
uhci->hc_inaccessible = 1;
del_timer(&uhci->stall_timer);
}
/*
* Last rites for a defunct/nonfunctional controller
* or one we don't want to use any more.
*/
static void hc_died(struct uhci_hcd *uhci)
{
reset_hc(uhci);
uhci->hc_inaccessible = 1;
}
