/*
* Initialize a controller that was newly discovered or has just been
* resumed. In either case we can't be sure of its previous state.
*
* Returns: 1 if the controller was reset, 0 otherwise.
*/
static int uhci_generic_check_and_reset_hc(struct uhci_hcd *uhci)
{
unsigned int cmd, intr;
/*
* When restarting a suspended controller, we expect all the
* settings to be the same as we left them:
*
* 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.
*/
cmd = uhci_readw(uhci, USBCMD);
if ((cmd & USBCMD_RS) || !(cmd & USBCMD_CF) || !(cmd & USBCMD_EGSM)) {
dev_dbg(uhci_dev(uhci), "%s: cmd = 0x%04x\n",
__func__, cmd);
goto reset_needed;
}
intr = uhci_readw(uhci, USBINTR);
if (intr & (~USBINTR_RESUME)) {
dev_dbg(uhci_dev(uhci), "%s: intr = 0x%04x\n",
__func__, intr);
goto reset_needed;
}
return 0;
reset_needed:
dev_dbg(uhci_dev(uhci), "Performing full reset\n");
uhci_generic_reset_hc(uhci);
return 1;
}
static int uhci_generic_check_and_reset_hc(struct uhci_hcd *uhci)
{
unsigned int cmd, intr;
/*
*/
cmd = uhci_readw(uhci, USBCMD);
if ((cmd & USBCMD_RS) || !(cmd & USBCMD_CF) || !(cmd & USBCMD_EGSM)) {
dev_dbg(uhci_dev(uhci), "%s: cmd = 0x%04x\n",
__func__, cmd);
goto reset_needed;
}
intr = uhci_readw(uhci, USBINTR);
if (intr & (~USBINTR_RESUME)) {
dev_dbg(uhci_dev(uhci), "%s: intr = 0x%04x\n",
__func__, intr);
goto reset_needed;
}
return 0;
reset_needed:
dev_dbg(uhci_dev(uhci), "Performing full reset\n");
uhci_generic_reset_hc(uhci);
return 1;
}
