559 lines
17 KiB
C
559 lines
17 KiB
C
/******************************************************************************
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
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* USA
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*
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* The full GNU General Public License is included in this distribution
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* in the file called LICENSE.GPL.
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*
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* Contact Information:
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* Intel Linux Wireless <ilw@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*
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* BSD LICENSE
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*
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* Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*****************************************************************************/
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#ifndef __iwl_trans_h__
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#define __iwl_trans_h__
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#include <linux/debugfs.h>
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#include <linux/skbuff.h>
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#include "iwl-shared.h"
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#include "iwl-commands.h"
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#include "iwl-ucode.h"
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#include "iwl-debug.h"
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/**
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* DOC: Transport layer - what is it ?
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*
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* The tranport layer is the layer that deals with the HW directly. It provides
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* an abstraction of the underlying HW to the upper layer. The transport layer
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* doesn't provide any policy, algorithm or anything of this kind, but only
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* mechanisms to make the HW do something.It is not completely stateless but
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* close to it.
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* We will have an implementation for each different supported bus.
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*/
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/**
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* DOC: Life cycle of the transport layer
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*
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* The transport layer has a very precise life cycle.
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*
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* 1) A helper function is called during the module initialization and
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* registers the bus driver's ops with the transport's alloc function.
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* 2) Bus's probe calls to the transport layer's allocation functions.
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* Of course this function is bus specific.
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* 3) This allocation functions will spawn the upper layer which will
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* register mac80211.
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*
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* 4) At some point (i.e. mac80211's start call), the op_mode will call
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* the following sequence:
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* start_hw
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* start_fw
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*
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* 5) Then when finished (or reset):
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* stop_fw (a.k.a. stop device for the moment)
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* stop_hw
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*
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* 6) Eventually, the free function will be called.
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*/
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/**
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* DOC: API needed by the transport layer from the op_mode
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*
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* TODO
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*/
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struct iwl_priv;
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struct iwl_shared;
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/**
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* DOC: Host command section
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*
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* A host command is a commaned issued by the upper layer to the fw. There are
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* several versions of fw that have several APIs. The transport layer is
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* completely agnostic to these differences.
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* The transport does provide helper functionnality (i.e. SYNC / ASYNC mode),
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*/
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#define SEQ_TO_SN(seq) (((seq) & IEEE80211_SCTL_SEQ) >> 4)
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#define SN_TO_SEQ(ssn) (((ssn) << 4) & IEEE80211_SCTL_SEQ)
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#define MAX_SN ((IEEE80211_SCTL_SEQ) >> 4)
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/**
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* enum CMD_MODE - how to send the host commands ?
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*
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* @CMD_SYNC: The caller will be stalled until the fw responds to the command
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* @CMD_ASYNC: Return right away and don't want for the response
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* @CMD_WANT_SKB: valid only with CMD_SYNC. The caller needs the buffer of the
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* response.
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* @CMD_ON_DEMAND: This command is sent by the test mode pipe.
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*/
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enum CMD_MODE {
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CMD_SYNC = 0,
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CMD_ASYNC = BIT(0),
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CMD_WANT_SKB = BIT(1),
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CMD_ON_DEMAND = BIT(2),
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};
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#define DEF_CMD_PAYLOAD_SIZE 320
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/**
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* struct iwl_device_cmd
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*
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* For allocation of the command and tx queues, this establishes the overall
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* size of the largest command we send to uCode, except for commands that
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* aren't fully copied and use other TFD space.
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*/
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struct iwl_device_cmd {
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struct iwl_cmd_header hdr; /* uCode API */
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u8 payload[DEF_CMD_PAYLOAD_SIZE];
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} __packed;
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#define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_device_cmd))
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#define IWL_MAX_CMD_TFDS 2
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/**
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* struct iwl_hcmd_dataflag - flag for each one of the chunks of the command
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*
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* IWL_HCMD_DFL_NOCOPY: By default, the command is copied to the host command's
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* ring. The transport layer doesn't map the command's buffer to DMA, but
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* rather copies it to an previously allocated DMA buffer. This flag tells
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* the transport layer not to copy the command, but to map the existing
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* buffer. This can save memcpy and is worth with very big comamnds.
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*/
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enum iwl_hcmd_dataflag {
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IWL_HCMD_DFL_NOCOPY = BIT(0),
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};
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/**
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* struct iwl_host_cmd - Host command to the uCode
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*
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* @data: array of chunks that composes the data of the host command
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* @reply_page: pointer to the page that holds the response to the host command
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* @handler_status: return value of the handler of the command
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* (put in setup_rx_handlers) - valid for SYNC mode only
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* @flags: can be CMD_*
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* @len: array of the lenths of the chunks in data
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* @dataflags: IWL_HCMD_DFL_*
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* @id: id of the host command
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*/
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struct iwl_host_cmd {
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const void *data[IWL_MAX_CMD_TFDS];
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unsigned long reply_page;
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int handler_status;
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u32 flags;
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u16 len[IWL_MAX_CMD_TFDS];
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u8 dataflags[IWL_MAX_CMD_TFDS];
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u8 id;
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};
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/**
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* struct iwl_trans_ops - transport specific operations
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*
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* All the handlers MUST be implemented
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*
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* @start_hw: starts the HW- from that point on, the HW can send interrupts
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* May sleep
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* @stop_hw: stops the HW- from that point on, the HW will be in low power but
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* will still issue interrupt if the HW RF kill is triggered.
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* May sleep
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* @start_fw: allocates and inits all the resources for the transport
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* layer. Also kick a fw image.
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* May sleep
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* @fw_alive: called when the fw sends alive notification
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* May sleep
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* @wake_any_queue: wake all the queues of a specfic context IWL_RXON_CTX_*
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* @stop_device:stops the whole device (embedded CPU put to reset)
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* May sleep
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* @send_cmd:send a host command
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* May sleep only if CMD_SYNC is set
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* @tx: send an skb
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* Must be atomic
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* @reclaim: free packet until ssn. Returns a list of freed packets.
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* Must be atomic
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* @tx_agg_alloc: allocate resources for a TX BA session
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* May sleep
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* @tx_agg_setup: setup a tx queue for AMPDU - will be called once the HW is
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* ready and a successful ADDBA response has been received.
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* May sleep
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* @tx_agg_disable: de-configure a Tx queue to send AMPDUs
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* May sleep
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* @free: release all the ressource for the transport layer itself such as
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* irq, tasklet etc... From this point on, the device may not issue
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* any interrupt (incl. RFKILL).
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* May sleep
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* @stop_queue: stop a specific queue
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* @check_stuck_queue: check if a specific queue is stuck
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* @wait_tx_queue_empty: wait until all tx queues are empty
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* May sleep
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* @dbgfs_register: add the dbgfs files under this directory. Files will be
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* automatically deleted.
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* @suspend: stop the device unless WoWLAN is configured
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* @resume: resume activity of the device
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* @write8: write a u8 to a register at offset ofs from the BAR
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* @write32: write a u32 to a register at offset ofs from the BAR
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* @read32: read a u32 register at offset ofs from the BAR
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*/
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struct iwl_trans_ops {
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int (*start_hw)(struct iwl_trans *iwl_trans);
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void (*stop_hw)(struct iwl_trans *iwl_trans);
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int (*start_fw)(struct iwl_trans *trans, struct fw_img *fw);
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void (*fw_alive)(struct iwl_trans *trans);
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void (*stop_device)(struct iwl_trans *trans);
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void (*wake_any_queue)(struct iwl_trans *trans,
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enum iwl_rxon_context_id ctx,
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const char *msg);
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int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
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int (*tx)(struct iwl_trans *trans, struct sk_buff *skb,
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struct iwl_device_cmd *dev_cmd, enum iwl_rxon_context_id ctx,
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u8 sta_id, u8 tid);
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int (*reclaim)(struct iwl_trans *trans, int sta_id, int tid,
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int txq_id, int ssn, u32 status,
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struct sk_buff_head *skbs);
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int (*tx_agg_disable)(struct iwl_trans *trans,
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int sta_id, int tid);
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int (*tx_agg_alloc)(struct iwl_trans *trans,
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int sta_id, int tid);
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void (*tx_agg_setup)(struct iwl_trans *trans,
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enum iwl_rxon_context_id ctx, int sta_id, int tid,
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int frame_limit, u16 ssn);
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void (*free)(struct iwl_trans *trans);
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void (*stop_queue)(struct iwl_trans *trans, int q, const char *msg);
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int (*dbgfs_register)(struct iwl_trans *trans, struct dentry* dir);
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int (*check_stuck_queue)(struct iwl_trans *trans, int q);
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int (*wait_tx_queue_empty)(struct iwl_trans *trans);
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#ifdef CONFIG_PM_SLEEP
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int (*suspend)(struct iwl_trans *trans);
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int (*resume)(struct iwl_trans *trans);
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#endif
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void (*write8)(struct iwl_trans *trans, u32 ofs, u8 val);
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void (*write32)(struct iwl_trans *trans, u32 ofs, u32 val);
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u32 (*read32)(struct iwl_trans *trans, u32 ofs);
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};
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/* Opaque calibration results */
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struct iwl_calib_result {
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struct list_head list;
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size_t cmd_len;
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struct iwl_calib_hdr hdr;
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/* data follows */
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};
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/**
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* enum iwl_trans_state - state of the transport layer
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*
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* @IWL_TRANS_NO_FW: no fw has sent an alive response
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* @IWL_TRANS_FW_ALIVE: a fw has sent an alive response
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*/
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enum iwl_trans_state {
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IWL_TRANS_NO_FW = 0,
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IWL_TRANS_FW_ALIVE = 1,
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};
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/**
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* struct iwl_trans - transport common data
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*
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* @ops - pointer to iwl_trans_ops
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* @shrd - pointer to iwl_shared which holds shared data from the upper layer
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* @hcmd_lock: protects HCMD
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* @reg_lock - protect hw register access
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* @dev - pointer to struct device * that represents the device
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* @irq - the irq number for the device
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* @hw_id: a u32 with the ID of the device / subdevice.
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* Set during transport allocation.
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* @hw_id_str: a string with info about HW ID. Set during transport allocation.
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* @ucode_write_complete: indicates that the ucode has been copied.
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* @nvm_device_type: indicates OTP or eeprom
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* @pm_support: set to true in start_hw if link pm is supported
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* @calib_results: list head for init calibration results
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*/
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struct iwl_trans {
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const struct iwl_trans_ops *ops;
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struct iwl_shared *shrd;
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enum iwl_trans_state state;
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spinlock_t hcmd_lock;
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spinlock_t reg_lock;
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struct device *dev;
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unsigned int irq;
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u32 hw_rev;
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u32 hw_id;
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char hw_id_str[52];
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u8 ucode_write_complete;
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int nvm_device_type;
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bool pm_support;
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struct list_head calib_results;
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/* pointer to trans specific struct */
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/*Ensure that this pointer will always be aligned to sizeof pointer */
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char trans_specific[0] __aligned(sizeof(void *));
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};
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static inline int iwl_trans_start_hw(struct iwl_trans *trans)
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{
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might_sleep();
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return trans->ops->start_hw(trans);
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}
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static inline void iwl_trans_stop_hw(struct iwl_trans *trans)
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{
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might_sleep();
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trans->ops->stop_hw(trans);
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trans->state = IWL_TRANS_NO_FW;
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}
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static inline void iwl_trans_fw_alive(struct iwl_trans *trans)
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{
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might_sleep();
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trans->ops->fw_alive(trans);
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trans->state = IWL_TRANS_FW_ALIVE;
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}
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static inline int iwl_trans_start_fw(struct iwl_trans *trans, struct fw_img *fw)
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{
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might_sleep();
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return trans->ops->start_fw(trans, fw);
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}
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static inline void iwl_trans_stop_device(struct iwl_trans *trans)
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{
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might_sleep();
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trans->ops->stop_device(trans);
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trans->state = IWL_TRANS_NO_FW;
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}
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static inline void iwl_trans_wake_any_queue(struct iwl_trans *trans,
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enum iwl_rxon_context_id ctx,
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const char *msg)
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{
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if (trans->state != IWL_TRANS_FW_ALIVE)
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IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
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trans->ops->wake_any_queue(trans, ctx, msg);
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}
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static inline int iwl_trans_send_cmd(struct iwl_trans *trans,
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struct iwl_host_cmd *cmd)
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{
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if (trans->state != IWL_TRANS_FW_ALIVE)
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IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
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return trans->ops->send_cmd(trans, cmd);
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}
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int iwl_trans_send_cmd_pdu(struct iwl_trans *trans, u8 id,
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u32 flags, u16 len, const void *data);
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static inline int iwl_trans_tx(struct iwl_trans *trans, struct sk_buff *skb,
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struct iwl_device_cmd *dev_cmd, enum iwl_rxon_context_id ctx,
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u8 sta_id, u8 tid)
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{
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if (trans->state != IWL_TRANS_FW_ALIVE)
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IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
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return trans->ops->tx(trans, skb, dev_cmd, ctx, sta_id, tid);
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}
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static inline int iwl_trans_reclaim(struct iwl_trans *trans, int sta_id,
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int tid, int txq_id, int ssn, u32 status,
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struct sk_buff_head *skbs)
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{
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if (trans->state != IWL_TRANS_FW_ALIVE)
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IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
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return trans->ops->reclaim(trans, sta_id, tid, txq_id, ssn,
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status, skbs);
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}
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static inline int iwl_trans_tx_agg_disable(struct iwl_trans *trans,
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int sta_id, int tid)
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{
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might_sleep();
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if (trans->state != IWL_TRANS_FW_ALIVE)
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IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
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return trans->ops->tx_agg_disable(trans, sta_id, tid);
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}
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static inline int iwl_trans_tx_agg_alloc(struct iwl_trans *trans,
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int sta_id, int tid)
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{
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might_sleep();
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if (trans->state != IWL_TRANS_FW_ALIVE)
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IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
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return trans->ops->tx_agg_alloc(trans, sta_id, tid);
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}
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static inline void iwl_trans_tx_agg_setup(struct iwl_trans *trans,
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enum iwl_rxon_context_id ctx,
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int sta_id, int tid,
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int frame_limit, u16 ssn)
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{
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might_sleep();
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if (trans->state != IWL_TRANS_FW_ALIVE)
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IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
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trans->ops->tx_agg_setup(trans, ctx, sta_id, tid, frame_limit, ssn);
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}
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static inline void iwl_trans_free(struct iwl_trans *trans)
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{
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trans->ops->free(trans);
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}
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static inline void iwl_trans_stop_queue(struct iwl_trans *trans, int q,
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const char *msg)
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{
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if (trans->state != IWL_TRANS_FW_ALIVE)
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IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
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trans->ops->stop_queue(trans, q, msg);
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}
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static inline int iwl_trans_wait_tx_queue_empty(struct iwl_trans *trans)
|
|
{
|
|
if (trans->state != IWL_TRANS_FW_ALIVE)
|
|
IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
|
|
|
|
return trans->ops->wait_tx_queue_empty(trans);
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|
}
|
|
|
|
static inline int iwl_trans_check_stuck_queue(struct iwl_trans *trans, int q)
|
|
{
|
|
if (trans->state != IWL_TRANS_FW_ALIVE)
|
|
IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
|
|
|
|
return trans->ops->check_stuck_queue(trans, q);
|
|
}
|
|
static inline int iwl_trans_dbgfs_register(struct iwl_trans *trans,
|
|
struct dentry *dir)
|
|
{
|
|
return trans->ops->dbgfs_register(trans, dir);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static inline int iwl_trans_suspend(struct iwl_trans *trans)
|
|
{
|
|
return trans->ops->suspend(trans);
|
|
}
|
|
|
|
static inline int iwl_trans_resume(struct iwl_trans *trans)
|
|
{
|
|
return trans->ops->resume(trans);
|
|
}
|
|
#endif
|
|
|
|
static inline void iwl_trans_write8(struct iwl_trans *trans, u32 ofs, u8 val)
|
|
{
|
|
trans->ops->write8(trans, ofs, val);
|
|
}
|
|
|
|
static inline void iwl_trans_write32(struct iwl_trans *trans, u32 ofs, u32 val)
|
|
{
|
|
trans->ops->write32(trans, ofs, val);
|
|
}
|
|
|
|
static inline u32 iwl_trans_read32(struct iwl_trans *trans, u32 ofs)
|
|
{
|
|
return trans->ops->read32(trans, ofs);
|
|
}
|
|
|
|
/*****************************************************
|
|
* Utils functions
|
|
******************************************************/
|
|
int iwl_send_calib_results(struct iwl_trans *trans);
|
|
int iwl_calib_set(struct iwl_trans *trans,
|
|
const struct iwl_calib_hdr *cmd, int len);
|
|
void iwl_calib_free_results(struct iwl_trans *trans);
|
|
|
|
/*****************************************************
|
|
* Transport layers implementations + their allocation function
|
|
******************************************************/
|
|
struct pci_dev;
|
|
struct pci_device_id;
|
|
extern const struct iwl_trans_ops trans_ops_pcie;
|
|
struct iwl_trans *iwl_trans_pcie_alloc(struct iwl_shared *shrd,
|
|
struct pci_dev *pdev,
|
|
const struct pci_device_id *ent);
|
|
|
|
extern const struct iwl_trans_ops trans_ops_idi;
|
|
struct iwl_trans *iwl_trans_idi_alloc(struct iwl_shared *shrd,
|
|
void *pdev_void,
|
|
const void *ent_void);
|
|
#endif /* __iwl_trans_h__ */
|