/*
* 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_cl_start_io
* Description: Interface to OS Layer for accepting SCSI requests.
*
* Input: ctlr_handle -- controller handle
* req_pkt -- OSL built request packet
* req_handle -- request handle
* Output: None
* Return value: 0 -- success
* non-zero-- failure
*/
TW_INT32
tw_cl_start_io(struct tw_cl_ctlr_handle *ctlr_handle,
struct tw_cl_req_packet *req_pkt, struct tw_cl_req_handle *req_handle)
{
struct tw_cli_ctlr_context *ctlr;
struct tw_cli_req_context *req;
struct tw_cl_command_9k *cmd;
struct tw_cl_scsi_req_packet *scsi_req;
TW_INT32 error = TW_CL_ERR_REQ_SUCCESS;
tw_cli_dbg_printf(10, ctlr_handle, tw_osl_cur_func(), "entered");
ctlr = (struct tw_cli_ctlr_context *)(ctlr_handle->cl_ctlr_ctxt);
/*
* If working with a firmware version that does not support multiple
* luns, and this request is directed at a non-zero lun, error it
* back right away.
*/
if ((req_pkt->gen_req_pkt.scsi_req.lun) &&
(ctlr->working_srl < TWA_MULTI_LUN_FW_SRL)) {
req_pkt->status |= (TW_CL_ERR_REQ_INVALID_LUN |
TW_CL_ERR_REQ_SCSI_ERROR);
req_pkt->tw_osl_callback(req_handle);
return(TW_CL_ERR_REQ_SUCCESS);
}
if ((req = tw_cli_get_request(ctlr
)) == TW_CL_NULL) {
tw_cli_dbg_printf(2, ctlr_handle, tw_osl_cur_func(),
"Out of request context packets: returning busy");
return(TW_OSL_EBUSY);
}
req_handle->cl_req_ctxt = req;
req->req_handle = req_handle;
req->orig_req = req_pkt;
req->tw_cli_callback = tw_cli_complete_io;
req->flags |= TW_CLI_REQ_FLAGS_EXTERNAL;
req->flags |= TW_CLI_REQ_FLAGS_9K;
scsi_req = &(req_pkt->gen_req_pkt.scsi_req);
/* Build the cmd pkt. */
cmd = &(req->cmd_pkt->command.cmd_pkt_9k);
req->cmd_pkt->cmd_hdr.header_desc.size_header = 128;
cmd->res__opcode = BUILD_RES__OPCODE(0, TWA_FW_CMD_EXECUTE_SCSI);
cmd->unit = (TW_UINT8)(scsi_req->unit);
cmd->lun_l4__req_id = TW_CL_SWAP16(
BUILD_LUN_L4__REQ_ID(scsi_req->lun, req->request_id));
cmd->status = 0;
cmd->sgl_offset = 16; /* offset from end of hdr = max cdb len */
tw_osl_memcpy(cmd->cdb, scsi_req->cdb, scsi_req->cdb_len);
if (req_pkt->flags & TW_CL_REQ_CALLBACK_FOR_SGLIST) {
TW_UINT32 num_sgl_entries;
req_pkt->tw_osl_sgl_callback(req_handle, cmd->sg_list,
&num_sgl_entries);
cmd->lun_h4__sgl_entries =
TW_CL_SWAP16(BUILD_LUN_H4__SGL_ENTRIES(scsi_req->lun,
num_sgl_entries));
} else {
cmd->lun_h4__sgl_entries =
TW_CL_SWAP16(BUILD_LUN_H4__SGL_ENTRIES(scsi_req->lun,
scsi_req->sgl_entries));
tw_cli_fill_sg_list(ctlr, scsi_req->sg_list,
cmd->sg_list, scsi_req->sgl_entries);
}
if (((TW_CL_Q_FIRST_ITEM(&(ctlr->req_q_head[TW_CLI_PENDING_Q]))) != TW_CL_NULL) ||
(ctlr->reset_in_progress)) {
tw_cli_req_q_insert_tail(req, TW_CLI_PENDING_Q);
TW_CLI_WRITE_CONTROL_REGISTER(ctlr_handle,
TWA_CONTROL_UNMASK_COMMAND_INTERRUPT);
} else if ((error = tw_cli_submit_cmd(req))) {
tw_cli_dbg_printf(2, ctlr_handle, tw_osl_cur_func(),
"Could not start request. request = %p, error = %d",
req, error);
tw_cli_req_q_insert_tail(req, TW_CLI_FREE_Q);
}
return(error);
}
