static void uhci_driver_fini(hcd_t *hcd)
{
assert(hcd);
hc_t *hc = hcd_get_driver_data(hcd);
if (hc)
hc_fini(hc);
hcd_set_implementation(hcd, NULL, NULL);
free(hc);
}
/** Take action based on the interrupt cause.
*
* @param[in] instance UHCI structure to use.
* @param[in] status Value of the status register at the time of interrupt.
*
* Interrupt might indicate:
* - transaction completed, either by triggering IOC, SPD, or an error
* - some kind of device error
* - resume from suspend state (not implemented)
*/
void hc_interrupt(hc_t *instance, uint16_t status)
{
assert(instance);
/* Lower 2 bits are transaction error and transaction complete */
if (status & (UHCI_STATUS_INTERRUPT | UHCI_STATUS_ERROR_INTERRUPT)) {
LIST_INITIALIZE(done);
transfer_list_remove_finished(
&instance->transfers_interrupt, &done);
transfer_list_remove_finished(
&instance->transfers_control_slow, &done);
transfer_list_remove_finished(
&instance->transfers_control_full, &done);
transfer_list_remove_finished(
&instance->transfers_bulk_full, &done);
while (!list_empty(&done)) {
link_t *item = list_first(&done);
list_remove(item);
uhci_transfer_batch_t *batch =
uhci_transfer_batch_from_link(item);
uhci_transfer_batch_finish_dispose(batch);
}
}
/* Resume interrupts are not supported */
if (status & UHCI_STATUS_RESUME) {
usb_log_error("Resume interrupt!\n");
}
/* Bits 4 and 5 indicate hc error */
if (status & (UHCI_STATUS_PROCESS_ERROR | UHCI_STATUS_SYSTEM_ERROR)) {
usb_log_error("UHCI hardware failure!.\n");
++instance->hw_failures;
transfer_list_abort_all(&instance->transfers_interrupt);
transfer_list_abort_all(&instance->transfers_control_slow);
transfer_list_abort_all(&instance->transfers_control_full);
transfer_list_abort_all(&instance->transfers_bulk_full);
if (instance->hw_failures < UHCI_ALLOWED_HW_FAIL) {
/* reinitialize hw, this triggers virtual disconnect*/
hc_init_hw(instance);
} else {
usb_log_fatal("Too many UHCI hardware failures!.\n");
hc_fini(instance);
}
}
}
