/*
* Function name: twa_interrupt
* Description: Interrupt handler. Determines the kind of interrupt,
* and returns TW_CL_TRUE if it recognizes the interrupt.
*
* Input: ctlr_handle -- controller handle
* Output: None
* Return value: TW_CL_TRUE -- interrupt recognized
* TW_CL_FALSE-- interrupt not recognized
*/
TW_INT32
tw_cl_interrupt(struct tw_cl_ctlr_handle *ctlr_handle)
{
struct tw_cli_ctlr_context *ctlr =
(struct tw_cli_ctlr_context *)(ctlr_handle->cl_ctlr_ctxt);
TW_UINT32 status_reg;
TW_INT32 rc = TW_CL_FALSE;
tw_cli_dbg_printf(10, ctlr_handle, tw_osl_cur_func(), "entered");
/* If we don't have controller context, bail */
if (ctlr == NULL)
goto out;
/*
* Bail If we get an interrupt while resetting, or shutting down.
*/
if (ctlr->reset_in_progress || !(ctlr->active))
goto out;
/* Read the status register to determine the type of interrupt. */
status_reg = TW_CLI_READ_STATUS_REGISTER(ctlr_handle);
if (tw_cli_check_ctlr_state(ctlr, status_reg))
goto out;
/* Clear the interrupt. */
if (status_reg & TWA_STATUS_HOST_INTERRUPT) {
tw_cli_dbg_printf(6, ctlr_handle, tw_osl_cur_func(),
"Host interrupt");
TW_CLI_WRITE_CONTROL_REGISTER(ctlr_handle,
TWA_CONTROL_CLEAR_HOST_INTERRUPT);
}
if (status_reg & TWA_STATUS_ATTENTION_INTERRUPT) {
tw_cli_dbg_printf(6, ctlr_handle, tw_osl_cur_func(),
"Attention interrupt");
rc |= TW_CL_TRUE; /* request for a deferred isr call */
tw_cli_process_attn_intr(ctlr);
TW_CLI_WRITE_CONTROL_REGISTER(ctlr_handle,
TWA_CONTROL_CLEAR_ATTENTION_INTERRUPT);
}
if (status_reg & TWA_STATUS_COMMAND_INTERRUPT) {
tw_cli_dbg_printf(6, ctlr_handle, tw_osl_cur_func(),
"Command interrupt");
rc |= TW_CL_TRUE; /* request for a deferred isr call */
tw_cli_process_cmd_intr(ctlr);
if ((TW_CL_Q_FIRST_ITEM(&(ctlr->req_q_head[TW_CLI_PENDING_Q]))) == TW_CL_NULL)
TW_CLI_WRITE_CONTROL_REGISTER(ctlr_handle,
TWA_CONTROL_MASK_COMMAND_INTERRUPT);
}
if (status_reg & TWA_STATUS_RESPONSE_INTERRUPT) {
tw_cli_dbg_printf(10, ctlr_handle, tw_osl_cur_func(),
"Response interrupt");
rc |= TW_CL_TRUE; /* request for a deferred isr call */
tw_cli_process_resp_intr(ctlr);
}
out:
return(rc);
}
/*
* Function name: tw_cli_process_resp_intr
* Description: Looks for cmd completions from fw; queues cmds completed
* by fw into complete queue.
*
* Input: ctlr -- ptr to CL internal ctlr context
* Output: None
* Return value: 0 -- no ctlr error
* non-zero-- ctlr error
*/
TW_INT32
tw_cli_process_resp_intr(struct tw_cli_ctlr_context *ctlr)
{
TW_UINT32 resp;
struct tw_cli_req_context *req;
TW_INT32 error;
TW_UINT32 status_reg;
tw_cli_dbg_printf(10, ctlr->ctlr_handle, tw_osl_cur_func(), "entered");
for (;;) {
status_reg = TW_CLI_READ_STATUS_REGISTER(ctlr->ctlr_handle);
if ((error = tw_cli_check_ctlr_state(ctlr, status_reg)))
break;
if (status_reg & TWA_STATUS_RESPONSE_QUEUE_EMPTY) {
tw_cli_dbg_printf(7, ctlr->ctlr_handle,
tw_osl_cur_func(), "Response queue empty");
break;
}
/* Response queue is not empty. */
resp = TW_CLI_READ_RESPONSE_QUEUE(ctlr->ctlr_handle);
{
req = &(ctlr->req_ctxt_buf[GET_RESP_ID(resp)]);
}
if (req->state != TW_CLI_REQ_STATE_BUSY) {
tw_cl_create_event(ctlr->ctlr_handle, TW_CL_FALSE,
TW_CL_MESSAGE_SOURCE_COMMON_LAYER_ERROR,
0x1201, 0x1, TW_CL_SEVERITY_ERROR_STRING,
"Unposted command completed!!",
"request = %p, status = %d",
req, req->state);
#ifdef TW_OSL_DEBUG
tw_cl_print_ctlr_stats(ctlr->ctlr_handle);
#endif /* TW_OSL_DEBUG */
tw_cl_reset_ctlr(ctlr->ctlr_handle);
return(TW_OSL_EIO);
}
/*
* Remove the request from the busy queue, mark it as complete,
* and enqueue it in the complete queue.
*/
tw_cli_req_q_remove_item(req, TW_CLI_BUSY_Q);
req->state = TW_CLI_REQ_STATE_COMPLETE;
tw_cli_req_q_insert_tail(req, TW_CLI_COMPLETE_Q);
}
/* Complete this, and other requests in the complete queue. */
tw_cli_process_complete_queue(ctlr);
return(error);
}