Merge branch 'kvm-ppc-next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus...

[karo-tx-linux.git] / drivers / net / wireless / intel / iwlwifi / iwl-trans.h

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
 * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 *****************************************************************************/
#ifndef __iwl_trans_h__
#define __iwl_trans_h__

#include <linux/ieee80211.h>
#include <linux/mm.h> /* for page_address */
#include <linux/lockdep.h>
#include <linux/kernel.h>

#include "iwl-debug.h"
#include "iwl-config.h"
#include "iwl-fw.h"
#include "iwl-op-mode.h"

/**
 * DOC: Transport layer - what is it ?
 *
 * The transport layer is the layer that deals with the HW directly. It provides
 * an abstraction of the underlying HW to the upper layer. The transport layer
 * doesn't provide any policy, algorithm or anything of this kind, but only
 * mechanisms to make the HW do something. It is not completely stateless but
 * close to it.
 * We will have an implementation for each different supported bus.
 */

/**
 * DOC: Life cycle of the transport layer
 *
 * The transport layer has a very precise life cycle.
 *
 *      1) A helper function is called during the module initialization and
 *         registers the bus driver's ops with the transport's alloc function.
 *      2) Bus's probe calls to the transport layer's allocation functions.
 *         Of course this function is bus specific.
 *      3) This allocation functions will spawn the upper layer which will
 *         register mac80211.
 *
 *      4) At some point (i.e. mac80211's start call), the op_mode will call
 *         the following sequence:
 *         start_hw
 *         start_fw
 *
 *      5) Then when finished (or reset):
 *         stop_device
 *
 *      6) Eventually, the free function will be called.
 */

/**
 * DOC: Host command section
 *
 * A host command is a command issued by the upper layer to the fw. There are
 * several versions of fw that have several APIs. The transport layer is
 * completely agnostic to these differences.
 * The transport does provide helper functionality (i.e. SYNC / ASYNC mode),
 */
#define SEQ_TO_QUEUE(s) (((s) >> 8) & 0x1f)
#define QUEUE_TO_SEQ(q) (((q) & 0x1f) << 8)
#define SEQ_TO_INDEX(s) ((s) & 0xff)
#define INDEX_TO_SEQ(i) ((i) & 0xff)
#define SEQ_RX_FRAME    cpu_to_le16(0x8000)

/*
 * those functions retrieve specific information from
 * the id field in the iwl_host_cmd struct which contains
 * the command id, the group id and the version of the command
 * and vice versa
*/
static inline u8 iwl_cmd_opcode(u32 cmdid)
{
        return cmdid & 0xFF;
}

static inline u8 iwl_cmd_groupid(u32 cmdid)
{
        return ((cmdid & 0xFF00) >> 8);
}

static inline u8 iwl_cmd_version(u32 cmdid)
{
        return ((cmdid & 0xFF0000) >> 16);
}

static inline u32 iwl_cmd_id(u8 opcode, u8 groupid, u8 version)
{
        return opcode + (groupid << 8) + (version << 16);
}

/* make u16 wide id out of u8 group and opcode */
#define WIDE_ID(grp, opcode) ((grp << 8) | opcode)
#define DEF_ID(opcode) ((1 << 8) | (opcode))

/* due to the conversion, this group is special; new groups
 * should be defined in the appropriate fw-api header files
 */
#define IWL_ALWAYS_LONG_GROUP   1

/**
 * struct iwl_cmd_header
 *
 * This header format appears in the beginning of each command sent from the
 * driver, and each response/notification received from uCode.
 */
struct iwl_cmd_header {
        u8 cmd;         /* Command ID:  REPLY_RXON, etc. */
        u8 group_id;
        /*
         * The driver sets up the sequence number to values of its choosing.
         * uCode does not use this value, but passes it back to the driver
         * when sending the response to each driver-originated command, so
         * the driver can match the response to the command.  Since the values
         * don't get used by uCode, the driver may set up an arbitrary format.
         *
         * There is one exception:  uCode sets bit 15 when it originates
         * the response/notification, i.e. when the response/notification
         * is not a direct response to a command sent by the driver.  For
         * example, uCode issues REPLY_RX when it sends a received frame
         * to the driver; it is not a direct response to any driver command.
         *
         * The Linux driver uses the following format:
         *
         *  0:7         tfd index - position within TX queue
         *  8:12        TX queue id
         *  13:14       reserved
         *  15          unsolicited RX or uCode-originated notification
         */
        __le16 sequence;
} __packed;

/**
 * struct iwl_cmd_header_wide
 *
 * This header format appears in the beginning of each command sent from the
 * driver, and each response/notification received from uCode.
 * this is the wide version that contains more information about the command
 * like length, version and command type
 */
struct iwl_cmd_header_wide {
        u8 cmd;
        u8 group_id;
        __le16 sequence;
        __le16 length;
        u8 reserved;
        u8 version;
} __packed;

#define FH_RSCSR_FRAME_SIZE_MSK         0x00003FFF      /* bits 0-13 */
#define FH_RSCSR_FRAME_INVALID          0x55550000
#define FH_RSCSR_FRAME_ALIGN            0x40
#define FH_RSCSR_RPA_EN                 BIT(25)
#define FH_RSCSR_RXQ_POS                16
#define FH_RSCSR_RXQ_MASK               0x3F0000

struct iwl_rx_packet {
        /*
         * The first 4 bytes of the RX frame header contain both the RX frame
         * size and some flags.
         * Bit fields:
         * 31:    flag flush RB request
         * 30:    flag ignore TC (terminal counter) request
         * 29:    flag fast IRQ request
         * 28-26: Reserved
         * 25:    Offload enabled
         * 24:    RPF enabled
         * 23:    RSS enabled
         * 22:    Checksum enabled
         * 21-16: RX queue
         * 15-14: Reserved
         * 13-00: RX frame size
         */
        __le32 len_n_flags;
        struct iwl_cmd_header hdr;
        u8 data[];
} __packed;

static inline u32 iwl_rx_packet_len(const struct iwl_rx_packet *pkt)
{
        return le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
}

static inline u32 iwl_rx_packet_payload_len(const struct iwl_rx_packet *pkt)
{
        return iwl_rx_packet_len(pkt) - sizeof(pkt->hdr);
}

/**
 * enum CMD_MODE - how to send the host commands ?
 *
 * @CMD_ASYNC: Return right away and don't wait for the response
 * @CMD_WANT_SKB: Not valid with CMD_ASYNC. The caller needs the buffer of
 *      the response. The caller needs to call iwl_free_resp when done.
 * @CMD_HIGH_PRIO: The command is high priority - it goes to the front of the
 *      command queue, but after other high priority commands. Valid only
 *      with CMD_ASYNC.
 * @CMD_SEND_IN_IDLE: The command should be sent even when the trans is idle.
 * @CMD_MAKE_TRANS_IDLE: The command response should mark the trans as idle.
 * @CMD_WAKE_UP_TRANS: The command response should wake up the trans
 *      (i.e. mark it as non-idle).
 * @CMD_WANT_ASYNC_CALLBACK: the op_mode's async callback function must be
 *      called after this command completes. Valid only with CMD_ASYNC.
 */
enum CMD_MODE {
        CMD_ASYNC               = BIT(0),
        CMD_WANT_SKB            = BIT(1),
        CMD_SEND_IN_RFKILL      = BIT(2),
        CMD_HIGH_PRIO           = BIT(3),
        CMD_SEND_IN_IDLE        = BIT(4),
        CMD_MAKE_TRANS_IDLE     = BIT(5),
        CMD_WAKE_UP_TRANS       = BIT(6),
        CMD_WANT_ASYNC_CALLBACK = BIT(7),
};

#define DEF_CMD_PAYLOAD_SIZE 320

/**
 * struct iwl_device_cmd
 *
 * For allocation of the command and tx queues, this establishes the overall
 * size of the largest command we send to uCode, except for commands that
 * aren't fully copied and use other TFD space.
 */
struct iwl_device_cmd {
        union {
                struct {
                        struct iwl_cmd_header hdr;      /* uCode API */
                        u8 payload[DEF_CMD_PAYLOAD_SIZE];
                };
                struct {
                        struct iwl_cmd_header_wide hdr_wide;
                        u8 payload_wide[DEF_CMD_PAYLOAD_SIZE -
                                        sizeof(struct iwl_cmd_header_wide) +
                                        sizeof(struct iwl_cmd_header)];
                };
        };
} __packed;

#define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_device_cmd))

/*
 * number of transfer buffers (fragments) per transmit frame descriptor;
 * this is just the driver's idea, the hardware supports 20
 */
#define IWL_MAX_CMD_TBS_PER_TFD 2

/**
 * struct iwl_hcmd_dataflag - flag for each one of the chunks of the command
 *
 * @IWL_HCMD_DFL_NOCOPY: By default, the command is copied to the host command's
 *      ring. The transport layer doesn't map the command's buffer to DMA, but
 *      rather copies it to a previously allocated DMA buffer. This flag tells
 *      the transport layer not to copy the command, but to map the existing
 *      buffer (that is passed in) instead. This saves the memcpy and allows
 *      commands that are bigger than the fixed buffer to be submitted.
 *      Note that a TFD entry after a NOCOPY one cannot be a normal copied one.
 * @IWL_HCMD_DFL_DUP: Only valid without NOCOPY, duplicate the memory for this
 *      chunk internally and free it again after the command completes. This
 *      can (currently) be used only once per command.
 *      Note that a TFD entry after a DUP one cannot be a normal copied one.
 */
enum iwl_hcmd_dataflag {
        IWL_HCMD_DFL_NOCOPY     = BIT(0),
        IWL_HCMD_DFL_DUP        = BIT(1),
};

/**
 * struct iwl_host_cmd - Host command to the uCode
 *
 * @data: array of chunks that composes the data of the host command
 * @resp_pkt: response packet, if %CMD_WANT_SKB was set
 * @_rx_page_order: (internally used to free response packet)
 * @_rx_page_addr: (internally used to free response packet)
 * @flags: can be CMD_*
 * @len: array of the lengths of the chunks in data
 * @dataflags: IWL_HCMD_DFL_*
 * @id: command id of the host command, for wide commands encoding the
 *      version and group as well
 */
struct iwl_host_cmd {
        const void *data[IWL_MAX_CMD_TBS_PER_TFD];
        struct iwl_rx_packet *resp_pkt;
        unsigned long _rx_page_addr;
        u32 _rx_page_order;

        u32 flags;
        u32 id;
        u16 len[IWL_MAX_CMD_TBS_PER_TFD];
        u8 dataflags[IWL_MAX_CMD_TBS_PER_TFD];
};

static inline void iwl_free_resp(struct iwl_host_cmd *cmd)
{
        free_pages(cmd->_rx_page_addr, cmd->_rx_page_order);
}

struct iwl_rx_cmd_buffer {
        struct page *_page;
        int _offset;
        bool _page_stolen;
        u32 _rx_page_order;
        unsigned int truesize;
};

static inline void *rxb_addr(struct iwl_rx_cmd_buffer *r)
{
        return (void *)((unsigned long)page_address(r->_page) + r->_offset);
}

static inline int rxb_offset(struct iwl_rx_cmd_buffer *r)
{
        return r->_offset;
}

static inline struct page *rxb_steal_page(struct iwl_rx_cmd_buffer *r)
{
        r->_page_stolen = true;
        get_page(r->_page);
        return r->_page;
}

static inline void iwl_free_rxb(struct iwl_rx_cmd_buffer *r)
{
        __free_pages(r->_page, r->_rx_page_order);
}

#define MAX_NO_RECLAIM_CMDS     6

#define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))

/*
 * Maximum number of HW queues the transport layer
 * currently supports
 */
#define IWL_MAX_HW_QUEUES               32
#define IWL_MAX_TVQM_QUEUES             512

#define IWL_MAX_TID_COUNT       8
#define IWL_MGMT_TID            15
#define IWL_FRAME_LIMIT 64
#define IWL_MAX_RX_HW_QUEUES    16

/**
 * enum iwl_wowlan_status - WoWLAN image/device status
 * @IWL_D3_STATUS_ALIVE: firmware is still running after resume
 * @IWL_D3_STATUS_RESET: device was reset while suspended
 */
enum iwl_d3_status {
        IWL_D3_STATUS_ALIVE,
        IWL_D3_STATUS_RESET,
};

/**
 * enum iwl_trans_status: transport status flags
 * @STATUS_SYNC_HCMD_ACTIVE: a SYNC command is being processed
 * @STATUS_DEVICE_ENABLED: APM is enabled
 * @STATUS_TPOWER_PMI: the device might be asleep (need to wake it up)
 * @STATUS_INT_ENABLED: interrupts are enabled
 * @STATUS_RFKILL: the HW RFkill switch is in KILL position
 * @STATUS_FW_ERROR: the fw is in error state
 * @STATUS_TRANS_GOING_IDLE: shutting down the trans, only special commands
 *      are sent
 * @STATUS_TRANS_IDLE: the trans is idle - general commands are not to be sent
 * @STATUS_TRANS_DEAD: trans is dead - avoid any read/write operation
 */
enum iwl_trans_status {
        STATUS_SYNC_HCMD_ACTIVE,
        STATUS_DEVICE_ENABLED,
        STATUS_TPOWER_PMI,
        STATUS_INT_ENABLED,
        STATUS_RFKILL,
        STATUS_FW_ERROR,
        STATUS_TRANS_GOING_IDLE,
        STATUS_TRANS_IDLE,
        STATUS_TRANS_DEAD,
};

static inline int
iwl_trans_get_rb_size_order(enum iwl_amsdu_size rb_size)
{
        switch (rb_size) {
        case IWL_AMSDU_4K:
                return get_order(4 * 1024);
        case IWL_AMSDU_8K:
                return get_order(8 * 1024);
        case IWL_AMSDU_12K:
                return get_order(12 * 1024);
        default:
                WARN_ON(1);
                return -1;
        }
}

struct iwl_hcmd_names {
        u8 cmd_id;
        const char *const cmd_name;
};

#define HCMD_NAME(x)    \
        { .cmd_id = x, .cmd_name = #x }

struct iwl_hcmd_arr {
        const struct iwl_hcmd_names *arr;
        int size;
};

#define HCMD_ARR(x)     \
        { .arr = x, .size = ARRAY_SIZE(x) }

/**
 * struct iwl_trans_config - transport configuration
 *
 * @op_mode: pointer to the upper layer.
 * @cmd_queue: the index of the command queue.
 *      Must be set before start_fw.
 * @cmd_fifo: the fifo for host commands
 * @cmd_q_wdg_timeout: the timeout of the watchdog timer for the command queue.
 * @no_reclaim_cmds: Some devices erroneously don't set the
 *      SEQ_RX_FRAME bit on some notifications, this is the
 *      list of such notifications to filter. Max length is
 *      %MAX_NO_RECLAIM_CMDS.
 * @n_no_reclaim_cmds: # of commands in list
 * @rx_buf_size: RX buffer size needed for A-MSDUs
 *      if unset 4k will be the RX buffer size
 * @bc_table_dword: set to true if the BC table expects the byte count to be
 *      in DWORD (as opposed to bytes)
 * @scd_set_active: should the transport configure the SCD for HCMD queue
 * @sw_csum_tx: transport should compute the TCP checksum
 * @command_groups: array of command groups, each member is an array of the
 *      commands in the group; for debugging only
 * @command_groups_size: number of command groups, to avoid illegal access
 * @sdio_adma_addr: the default address to set for the ADMA in SDIO mode until
 *      we get the ALIVE from the uCode
 * @cb_data_offs: offset inside skb->cb to store transport data at, must have
 *      space for at least two pointers
 */
struct iwl_trans_config {
        struct iwl_op_mode *op_mode;

        u8 cmd_queue;
        u8 cmd_fifo;
        unsigned int cmd_q_wdg_timeout;
        const u8 *no_reclaim_cmds;
        unsigned int n_no_reclaim_cmds;

        enum iwl_amsdu_size rx_buf_size;
        bool bc_table_dword;
        bool scd_set_active;
        bool sw_csum_tx;
        const struct iwl_hcmd_arr *command_groups;
        int command_groups_size;

        u32 sdio_adma_addr;

        u8 cb_data_offs;
};

struct iwl_trans_dump_data {
        u32 len;
        u8 data[];
};

struct iwl_trans;

struct iwl_trans_txq_scd_cfg {
        u8 fifo;
        u8 sta_id;
        u8 tid;
        bool aggregate;
        int frame_limit;
};

/* Available options for &struct iwl_tx_queue_cfg_cmd */
enum iwl_tx_queue_cfg_actions {
        TX_QUEUE_CFG_ENABLE_QUEUE               = BIT(0),
        TX_QUEUE_CFG_TFD_SHORT_FORMAT           = BIT(1),
};

/**
 * struct iwl_tx_queue_cfg_cmd - txq hw scheduler config command
 * @sta_id: station id
 * @tid: tid of the queue
 * @flags: Bit 0 - on enable, off - disable, Bit 1 - short TFD format
 * @cb_size: size of TFD cyclic buffer. Value is exponent - 3.
 *      Minimum value 0 (8 TFDs), maximum value 5 (256 TFDs)
 * @byte_cnt_addr: address of byte count table
 * @tfdq_addr: address of TFD circular buffer
 */
struct iwl_tx_queue_cfg_cmd {
        u8 sta_id;
        u8 tid;
        __le16 flags;
        __le32 cb_size;
        __le64 byte_cnt_addr;
        __le64 tfdq_addr;
} __packed; /* TX_QUEUE_CFG_CMD_API_S_VER_2 */

/**
 * struct iwl_tx_queue_cfg_rsp - response to txq hw scheduler config
 * @queue_number: queue number assigned to this RA -TID
 * @flags: set on failure
 * @write_pointer: initial value for write pointer
 */
struct iwl_tx_queue_cfg_rsp {
        __le16 queue_number;
        __le16 flags;
        __le16 write_pointer;
        __le16 reserved;
} __packed; /* TX_QUEUE_CFG_RSP_API_S_VER_2 */

/**
 * struct iwl_trans_ops - transport specific operations
 *
 * All the handlers MUST be implemented
 *
 * @start_hw: starts the HW. If low_power is true, the NIC needs to be taken
 *      out of a low power state. From that point on, the HW can send
 *      interrupts. May sleep.
 * @op_mode_leave: Turn off the HW RF kill indication if on
 *      May sleep
 * @start_fw: allocates and inits all the resources for the transport
 *      layer. Also kick a fw image.
 *      May sleep
 * @fw_alive: called when the fw sends alive notification. If the fw provides
 *      the SCD base address in SRAM, then provide it here, or 0 otherwise.
 *      May sleep
 * @stop_device: stops the whole device (embedded CPU put to reset) and stops
 *      the HW. If low_power is true, the NIC will be put in low power state.
 *      From that point on, the HW will be stopped but will still issue an
 *      interrupt if the HW RF kill switch is triggered.
 *      This callback must do the right thing and not crash even if %start_hw()
 *      was called but not &start_fw(). May sleep.
 * @d3_suspend: put the device into the correct mode for WoWLAN during
 *      suspend. This is optional, if not implemented WoWLAN will not be
 *      supported. This callback may sleep.
 * @d3_resume: resume the device after WoWLAN, enabling the opmode to
 *      talk to the WoWLAN image to get its status. This is optional, if not
 *      implemented WoWLAN will not be supported. This callback may sleep.
 * @send_cmd:send a host command. Must return -ERFKILL if RFkill is asserted.
 *      If RFkill is asserted in the middle of a SYNC host command, it must
 *      return -ERFKILL straight away.
 *      May sleep only if CMD_ASYNC is not set
 * @tx: send an skb. The transport relies on the op_mode to zero the
 *      the ieee80211_tx_info->driver_data. If the MPDU is an A-MSDU, all
 *      the CSUM will be taken care of (TCP CSUM and IP header in case of
 *      IPv4). If the MPDU is a single MSDU, the op_mode must compute the IP
 *      header if it is IPv4.
 *      Must be atomic
 * @reclaim: free packet until ssn. Returns a list of freed packets.
 *      Must be atomic
 * @txq_enable: setup a queue. To setup an AC queue, use the
 *      iwl_trans_ac_txq_enable wrapper. fw_alive must have been called before
 *      this one. The op_mode must not configure the HCMD queue. The scheduler
 *      configuration may be %NULL, in which case the hardware will not be
 *      configured. May sleep.
 * @txq_disable: de-configure a Tx queue to send AMPDUs
 *      Must be atomic
 * @txq_set_shared_mode: change Tx queue shared/unshared marking
 * @wait_tx_queue_empty: wait until tx queues are empty. May sleep.
 * @freeze_txq_timer: prevents the timer of the queue from firing until the
 *      queue is set to awake. Must be atomic.
 * @block_txq_ptrs: stop updating the write pointers of the Tx queues. Note
 *      that the transport needs to refcount the calls since this function
 *      will be called several times with block = true, and then the queues
 *      need to be unblocked only after the same number of calls with
 *      block = false.
 * @write8: write a u8 to a register at offset ofs from the BAR
 * @write32: write a u32 to a register at offset ofs from the BAR
 * @read32: read a u32 register at offset ofs from the BAR
 * @read_prph: read a DWORD from a periphery register
 * @write_prph: write a DWORD to a periphery register
 * @read_mem: read device's SRAM in DWORD
 * @write_mem: write device's SRAM in DWORD. If %buf is %NULL, then the memory
 *      will be zeroed.
 * @configure: configure parameters required by the transport layer from
 *      the op_mode. May be called several times before start_fw, can't be
 *      called after that.
 * @set_pmi: set the power pmi state
 * @grab_nic_access: wake the NIC to be able to access non-HBUS regs.
 *      Sleeping is not allowed between grab_nic_access and
 *      release_nic_access.
 * @release_nic_access: let the NIC go to sleep. The "flags" parameter
 *      must be the same one that was sent before to the grab_nic_access.
 * @set_bits_mask - set SRAM register according to value and mask.
 * @ref: grab a reference to the transport/FW layers, disallowing
 *      certain low power states
 * @unref: release a reference previously taken with @ref. Note that
 *      initially the reference count is 1, making an initial @unref
 *      necessary to allow low power states.
 * @dump_data: return a vmalloc'ed buffer with debug data, maybe containing last
 *      TX'ed commands and similar. The buffer will be vfree'd by the caller.
 *      Note that the transport must fill in the proper file headers.
 */
struct iwl_trans_ops {

        int (*start_hw)(struct iwl_trans *iwl_trans, bool low_power);
        void (*op_mode_leave)(struct iwl_trans *iwl_trans);
        int (*start_fw)(struct iwl_trans *trans, const struct fw_img *fw,
                        bool run_in_rfkill);
        int (*update_sf)(struct iwl_trans *trans,
                         struct iwl_sf_region *st_fwrd_space);
        void (*fw_alive)(struct iwl_trans *trans, u32 scd_addr);
        void (*stop_device)(struct iwl_trans *trans, bool low_power);

        void (*d3_suspend)(struct iwl_trans *trans, bool test, bool reset);
        int (*d3_resume)(struct iwl_trans *trans, enum iwl_d3_status *status,
                         bool test, bool reset);

        int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd);

        int (*tx)(struct iwl_trans *trans, struct sk_buff *skb,
                  struct iwl_device_cmd *dev_cmd, int queue);
        void (*reclaim)(struct iwl_trans *trans, int queue, int ssn,
                        struct sk_buff_head *skbs);

        void (*txq_enable)(struct iwl_trans *trans, int queue, u16 ssn,
                           const struct iwl_trans_txq_scd_cfg *cfg,
                           unsigned int queue_wdg_timeout);
        void (*txq_disable)(struct iwl_trans *trans, int queue,
                            bool configure_scd);
        /* a000 functions */
        int (*txq_alloc)(struct iwl_trans *trans,
                         struct iwl_tx_queue_cfg_cmd *cmd,
                         int cmd_id,
                         unsigned int queue_wdg_timeout);
        void (*txq_free)(struct iwl_trans *trans, int queue);

        void (*txq_set_shared_mode)(struct iwl_trans *trans, u32 txq_id,
                                    bool shared);

        int (*wait_tx_queues_empty)(struct iwl_trans *trans, u32 txq_bm);
        void (*freeze_txq_timer)(struct iwl_trans *trans, unsigned long txqs,
                                 bool freeze);
        void (*block_txq_ptrs)(struct iwl_trans *trans, bool block);

        void (*write8)(struct iwl_trans *trans, u32 ofs, u8 val);
        void (*write32)(struct iwl_trans *trans, u32 ofs, u32 val);
        u32 (*read32)(struct iwl_trans *trans, u32 ofs);
        u32 (*read_prph)(struct iwl_trans *trans, u32 ofs);
        void (*write_prph)(struct iwl_trans *trans, u32 ofs, u32 val);
        int (*read_mem)(struct iwl_trans *trans, u32 addr,
                        void *buf, int dwords);
        int (*write_mem)(struct iwl_trans *trans, u32 addr,
                         const void *buf, int dwords);
        void (*configure)(struct iwl_trans *trans,
                          const struct iwl_trans_config *trans_cfg);
        void (*set_pmi)(struct iwl_trans *trans, bool state);
        bool (*grab_nic_access)(struct iwl_trans *trans, unsigned long *flags);
        void (*release_nic_access)(struct iwl_trans *trans,
                                   unsigned long *flags);
        void (*set_bits_mask)(struct iwl_trans *trans, u32 reg, u32 mask,
                              u32 value);
        void (*ref)(struct iwl_trans *trans);
        void (*unref)(struct iwl_trans *trans);
        int  (*suspend)(struct iwl_trans *trans);
        void (*resume)(struct iwl_trans *trans);

        struct iwl_trans_dump_data *(*dump_data)(struct iwl_trans *trans,
                                                 const struct iwl_fw_dbg_trigger_tlv
                                                 *trigger);
};

/**
 * enum iwl_trans_state - state of the transport layer
 *
 * @IWL_TRANS_NO_FW: no fw has sent an alive response
 * @IWL_TRANS_FW_ALIVE: a fw has sent an alive response
 */
enum iwl_trans_state {
        IWL_TRANS_NO_FW = 0,
        IWL_TRANS_FW_ALIVE      = 1,
};

/**
 * DOC: Platform power management
 *
 * There are two types of platform power management: system-wide
 * (WoWLAN) and runtime.
 *
 * In system-wide power management the entire platform goes into a low
 * power state (e.g. idle or suspend to RAM) at the same time and the
 * device is configured as a wakeup source for the entire platform.
 * This is usually triggered by userspace activity (e.g. the user
 * presses the suspend button or a power management daemon decides to
 * put the platform in low power mode).  The device's behavior in this
 * mode is dictated by the wake-on-WLAN configuration.
 *
 * In runtime power management, only the devices which are themselves
 * idle enter a low power state.  This is done at runtime, which means
 * that the entire system is still running normally.  This mode is
 * usually triggered automatically by the device driver and requires
 * the ability to enter and exit the low power modes in a very short
 * time, so there is not much impact in usability.
 *
 * The terms used for the device's behavior are as follows:
 *
 *      - D0: the device is fully powered and the host is awake;
 *      - D3: the device is in low power mode and only reacts to
 *              specific events (e.g. magic-packet received or scan
 *              results found);
 *      - D0I3: the device is in low power mode and reacts to any
 *              activity (e.g. RX);
 *
 * These terms reflect the power modes in the firmware and are not to
 * be confused with the physical device power state.  The NIC can be
 * in D0I3 mode even if, for instance, the PCI device is in D3 state.
 */

/**
 * enum iwl_plat_pm_mode - platform power management mode
 *
 * This enumeration describes the device's platform power management
 * behavior when in idle mode (i.e. runtime power management) or when
 * in system-wide suspend (i.e WoWLAN).
 *
 * @IWL_PLAT_PM_MODE_DISABLED: power management is disabled for this
 *      device.  At runtime, this means that nothing happens and the
 *      device always remains in active.  In system-wide suspend mode,
 *      it means that the all connections will be closed automatically
 *      by mac80211 before the platform is suspended.
 * @IWL_PLAT_PM_MODE_D3: the device goes into D3 mode (i.e. WoWLAN).
 *      For runtime power management, this mode is not officially
 *      supported.
 * @IWL_PLAT_PM_MODE_D0I3: the device goes into D0I3 mode.
 */
enum iwl_plat_pm_mode {
        IWL_PLAT_PM_MODE_DISABLED,
        IWL_PLAT_PM_MODE_D3,
        IWL_PLAT_PM_MODE_D0I3,
};

/* Max time to wait for trans to become idle/non-idle on d0i3
 * enter/exit (in msecs).
 */
#define IWL_TRANS_IDLE_TIMEOUT 2000

/**
 * struct iwl_trans - transport common data
 *
 * @ops - pointer to iwl_trans_ops
 * @op_mode - pointer to the op_mode
 * @cfg - pointer to the configuration
 * @drv - pointer to iwl_drv
 * @status: a bit-mask of transport status flags
 * @dev - pointer to struct device * that represents the device
 * @max_skb_frags: maximum number of fragments an SKB can have when transmitted.
 *      0 indicates that frag SKBs (NETIF_F_SG) aren't supported.
 * @hw_rf_id a u32 with the device RF ID
 * @hw_id: a u32 with the ID of the device / sub-device.
 *      Set during transport allocation.
 * @hw_id_str: a string with info about HW ID. Set during transport allocation.
 * @pm_support: set to true in start_hw if link pm is supported
 * @ltr_enabled: set to true if the LTR is enabled
 * @wide_cmd_header: true when ucode supports wide command header format
 * @num_rx_queues: number of RX queues allocated by the transport;
 *      the transport must set this before calling iwl_drv_start()
 * @dev_cmd_pool: pool for Tx cmd allocation - for internal use only.
 *      The user should use iwl_trans_{alloc,free}_tx_cmd.
 * @rx_mpdu_cmd: MPDU RX command ID, must be assigned by opmode before
 *      starting the firmware, used for tracing
 * @rx_mpdu_cmd_hdr_size: used for tracing, amount of data before the
 *      start of the 802.11 header in the @rx_mpdu_cmd
 * @dflt_pwr_limit: default power limit fetched from the platform (ACPI)
 * @dbg_dest_tlv: points to the destination TLV for debug
 * @dbg_conf_tlv: array of pointers to configuration TLVs for debug
 * @dbg_trigger_tlv: array of pointers to triggers TLVs for debug
 * @dbg_dest_reg_num: num of reg_ops in %dbg_dest_tlv
 * @paging_req_addr: The location were the FW will upload / download the pages
 *      from. The address is set by the opmode
 * @paging_db: Pointer to the opmode paging data base, the pointer is set by
 *      the opmode.
 * @paging_download_buf: Buffer used for copying all of the pages before
 *      downloading them to the FW. The buffer is allocated in the opmode
 * @system_pm_mode: the system-wide power management mode in use.
 *      This mode is set dynamically, depending on the WoWLAN values
 *      configured from the userspace at runtime.
 * @runtime_pm_mode: the runtime power management mode in use.  This
 *      mode is set during the initialization phase and is not
 *      supposed to change during runtime.
 */
struct iwl_trans {
        const struct iwl_trans_ops *ops;
        struct iwl_op_mode *op_mode;
        const struct iwl_cfg *cfg;
        struct iwl_drv *drv;
        enum iwl_trans_state state;
        unsigned long status;

        struct device *dev;
        u32 max_skb_frags;
        u32 hw_rev;
        u32 hw_rf_id;
        u32 hw_id;
        char hw_id_str[52];

        u8 rx_mpdu_cmd, rx_mpdu_cmd_hdr_size;

        bool pm_support;
        bool ltr_enabled;

        const struct iwl_hcmd_arr *command_groups;
        int command_groups_size;
        bool wide_cmd_header;

        u8 num_rx_queues;

        /* The following fields are internal only */
        struct kmem_cache *dev_cmd_pool;
        char dev_cmd_pool_name[50];

        struct dentry *dbgfs_dir;

#ifdef CONFIG_LOCKDEP
        struct lockdep_map sync_cmd_lockdep_map;
#endif

        u64 dflt_pwr_limit;

        const struct iwl_fw_dbg_dest_tlv *dbg_dest_tlv;
        const struct iwl_fw_dbg_conf_tlv *dbg_conf_tlv[FW_DBG_CONF_MAX];
        struct iwl_fw_dbg_trigger_tlv * const *dbg_trigger_tlv;
        u8 dbg_dest_reg_num;

        /*
         * Paging parameters - All of the parameters should be set by the
         * opmode when paging is enabled
         */
        u32 paging_req_addr;
        struct iwl_fw_paging *paging_db;
        void *paging_download_buf;

        enum iwl_plat_pm_mode system_pm_mode;
        enum iwl_plat_pm_mode runtime_pm_mode;
        bool suspending;

        /* pointer to trans specific struct */
        /*Ensure that this pointer will always be aligned to sizeof pointer */
        char trans_specific[0] __aligned(sizeof(void *));
};

const char *iwl_get_cmd_string(struct iwl_trans *trans, u32 id);
int iwl_cmd_groups_verify_sorted(const struct iwl_trans_config *trans);

static inline void iwl_trans_configure(struct iwl_trans *trans,
                                       const struct iwl_trans_config *trans_cfg)
{
        trans->op_mode = trans_cfg->op_mode;

        trans->ops->configure(trans, trans_cfg);
        WARN_ON(iwl_cmd_groups_verify_sorted(trans_cfg));
}

static inline int _iwl_trans_start_hw(struct iwl_trans *trans, bool low_power)
{
        might_sleep();

        return trans->ops->start_hw(trans, low_power);
}

static inline int iwl_trans_start_hw(struct iwl_trans *trans)
{
        return trans->ops->start_hw(trans, true);
}

static inline void iwl_trans_op_mode_leave(struct iwl_trans *trans)
{
        might_sleep();

        if (trans->ops->op_mode_leave)
                trans->ops->op_mode_leave(trans);

        trans->op_mode = NULL;

        trans->state = IWL_TRANS_NO_FW;
}

static inline void iwl_trans_fw_alive(struct iwl_trans *trans, u32 scd_addr)
{
        might_sleep();

        trans->state = IWL_TRANS_FW_ALIVE;

        trans->ops->fw_alive(trans, scd_addr);
}

static inline int iwl_trans_start_fw(struct iwl_trans *trans,
                                     const struct fw_img *fw,
                                     bool run_in_rfkill)
{
        might_sleep();

        WARN_ON_ONCE(!trans->rx_mpdu_cmd);

        clear_bit(STATUS_FW_ERROR, &trans->status);
        return trans->ops->start_fw(trans, fw, run_in_rfkill);
}

static inline int iwl_trans_update_sf(struct iwl_trans *trans,
                                      struct iwl_sf_region *st_fwrd_space)
{
        might_sleep();

        if (trans->ops->update_sf)
                return trans->ops->update_sf(trans, st_fwrd_space);

        return 0;
}

static inline void _iwl_trans_stop_device(struct iwl_trans *trans,
                                          bool low_power)
{
        might_sleep();

        trans->ops->stop_device(trans, low_power);

        trans->state = IWL_TRANS_NO_FW;
}

static inline void iwl_trans_stop_device(struct iwl_trans *trans)
{
        _iwl_trans_stop_device(trans, true);
}

static inline void iwl_trans_d3_suspend(struct iwl_trans *trans, bool test,
                                        bool reset)
{
        might_sleep();
        if (trans->ops->d3_suspend)
                trans->ops->d3_suspend(trans, test, reset);
}

static inline int iwl_trans_d3_resume(struct iwl_trans *trans,
                                      enum iwl_d3_status *status,
                                      bool test, bool reset)
{
        might_sleep();
        if (!trans->ops->d3_resume)
                return 0;

        return trans->ops->d3_resume(trans, status, test, reset);
}

static inline void iwl_trans_ref(struct iwl_trans *trans)
{
        if (trans->ops->ref)
                trans->ops->ref(trans);
}

static inline void iwl_trans_unref(struct iwl_trans *trans)
{
        if (trans->ops->unref)
                trans->ops->unref(trans);
}

static inline int iwl_trans_suspend(struct iwl_trans *trans)
{
        if (!trans->ops->suspend)
                return 0;

        return trans->ops->suspend(trans);
}

static inline void iwl_trans_resume(struct iwl_trans *trans)
{
        if (trans->ops->resume)
                trans->ops->resume(trans);
}

static inline struct iwl_trans_dump_data *
iwl_trans_dump_data(struct iwl_trans *trans,
                    const struct iwl_fw_dbg_trigger_tlv *trigger)
{
        if (!trans->ops->dump_data)
                return NULL;
        return trans->ops->dump_data(trans, trigger);
}

static inline struct iwl_device_cmd *
iwl_trans_alloc_tx_cmd(struct iwl_trans *trans)
{
        struct iwl_device_cmd *dev_cmd_ptr =
                kmem_cache_alloc(trans->dev_cmd_pool, GFP_ATOMIC);

        if (unlikely(dev_cmd_ptr == NULL))
                return NULL;

        return dev_cmd_ptr;
}

int iwl_trans_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd);

static inline void iwl_trans_free_tx_cmd(struct iwl_trans *trans,
                                         struct iwl_device_cmd *dev_cmd)
{
        kmem_cache_free(trans->dev_cmd_pool, dev_cmd);
}

static inline int iwl_trans_tx(struct iwl_trans *trans, struct sk_buff *skb,
                               struct iwl_device_cmd *dev_cmd, int queue)
{
        if (unlikely(test_bit(STATUS_FW_ERROR, &trans->status)))
                return -EIO;

        if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
                IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
                return -EIO;
        }

        return trans->ops->tx(trans, skb, dev_cmd, queue);
}

static inline void iwl_trans_reclaim(struct iwl_trans *trans, int queue,
                                     int ssn, struct sk_buff_head *skbs)
{
        if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
                IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
                return;
        }

        trans->ops->reclaim(trans, queue, ssn, skbs);
}

static inline void iwl_trans_txq_disable(struct iwl_trans *trans, int queue,
                                         bool configure_scd)
{
        trans->ops->txq_disable(trans, queue, configure_scd);
}

static inline void
iwl_trans_txq_enable_cfg(struct iwl_trans *trans, int queue, u16 ssn,
                         const struct iwl_trans_txq_scd_cfg *cfg,
                         unsigned int queue_wdg_timeout)
{
        might_sleep();

        if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
                IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
                return;
        }

        trans->ops->txq_enable(trans, queue, ssn, cfg, queue_wdg_timeout);
}

static inline void
iwl_trans_txq_free(struct iwl_trans *trans, int queue)
{
        if (WARN_ON_ONCE(!trans->ops->txq_free))
                return;

        trans->ops->txq_free(trans, queue);
}

static inline int
iwl_trans_txq_alloc(struct iwl_trans *trans,
                    struct iwl_tx_queue_cfg_cmd *cmd,
                    int cmd_id,
                    unsigned int queue_wdg_timeout)
{
        might_sleep();

        if (WARN_ON_ONCE(!trans->ops->txq_alloc))
                return -ENOTSUPP;

        if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
                IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
                return -EIO;
        }

        return trans->ops->txq_alloc(trans, cmd, cmd_id, queue_wdg_timeout);
}

static inline void iwl_trans_txq_set_shared_mode(struct iwl_trans *trans,
                                                 int queue, bool shared_mode)
{
        if (trans->ops->txq_set_shared_mode)
                trans->ops->txq_set_shared_mode(trans, queue, shared_mode);
}

static inline void iwl_trans_txq_enable(struct iwl_trans *trans, int queue,
                                        int fifo, int sta_id, int tid,
                                        int frame_limit, u16 ssn,
                                        unsigned int queue_wdg_timeout)
{
        struct iwl_trans_txq_scd_cfg cfg = {
                .fifo = fifo,
                .sta_id = sta_id,
                .tid = tid,
                .frame_limit = frame_limit,
                .aggregate = sta_id >= 0,
        };

        iwl_trans_txq_enable_cfg(trans, queue, ssn, &cfg, queue_wdg_timeout);
}

static inline
void iwl_trans_ac_txq_enable(struct iwl_trans *trans, int queue, int fifo,
                             unsigned int queue_wdg_timeout)
{
        struct iwl_trans_txq_scd_cfg cfg = {
                .fifo = fifo,
                .sta_id = -1,
                .tid = IWL_MAX_TID_COUNT,
                .frame_limit = IWL_FRAME_LIMIT,
                .aggregate = false,
        };

        iwl_trans_txq_enable_cfg(trans, queue, 0, &cfg, queue_wdg_timeout);
}

static inline void iwl_trans_freeze_txq_timer(struct iwl_trans *trans,
                                              unsigned long txqs,
                                              bool freeze)
{
        if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
                IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
                return;
        }

        if (trans->ops->freeze_txq_timer)
                trans->ops->freeze_txq_timer(trans, txqs, freeze);
}

static inline void iwl_trans_block_txq_ptrs(struct iwl_trans *trans,
                                            bool block)
{
        if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
                IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
                return;
        }

        if (trans->ops->block_txq_ptrs)
                trans->ops->block_txq_ptrs(trans, block);
}

static inline int iwl_trans_wait_tx_queues_empty(struct iwl_trans *trans,
                                                 u32 txqs)
{
        if (WARN_ON_ONCE(trans->state != IWL_TRANS_FW_ALIVE)) {
                IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
                return -EIO;
        }

        return trans->ops->wait_tx_queues_empty(trans, txqs);
}

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);
}

static inline u32 iwl_trans_read_prph(struct iwl_trans *trans, u32 ofs)
{
        return trans->ops->read_prph(trans, ofs);
}

static inline void iwl_trans_write_prph(struct iwl_trans *trans, u32 ofs,
                                        u32 val)
{
        return trans->ops->write_prph(trans, ofs, val);
}

static inline int iwl_trans_read_mem(struct iwl_trans *trans, u32 addr,
                                     void *buf, int dwords)
{
        return trans->ops->read_mem(trans, addr, buf, dwords);
}

#define iwl_trans_read_mem_bytes(trans, addr, buf, bufsize)                   \
        do {                                                                  \
                if (__builtin_constant_p(bufsize))                            \
                        BUILD_BUG_ON((bufsize) % sizeof(u32));                \
                iwl_trans_read_mem(trans, addr, buf, (bufsize) / sizeof(u32));\
        } while (0)

static inline u32 iwl_trans_read_mem32(struct iwl_trans *trans, u32 addr)
{
        u32 value;

        if (WARN_ON(iwl_trans_read_mem(trans, addr, &value, 1)))
                return 0xa5a5a5a5;

        return value;
}

static inline int iwl_trans_write_mem(struct iwl_trans *trans, u32 addr,
                                      const void *buf, int dwords)
{
        return trans->ops->write_mem(trans, addr, buf, dwords);
}

static inline u32 iwl_trans_write_mem32(struct iwl_trans *trans, u32 addr,
                                        u32 val)
{
        return iwl_trans_write_mem(trans, addr, &val, 1);
}

static inline void iwl_trans_set_pmi(struct iwl_trans *trans, bool state)
{
        if (trans->ops->set_pmi)
                trans->ops->set_pmi(trans, state);
}

static inline void
iwl_trans_set_bits_mask(struct iwl_trans *trans, u32 reg, u32 mask, u32 value)
{
        trans->ops->set_bits_mask(trans, reg, mask, value);
}

#define iwl_trans_grab_nic_access(trans, flags) \
        __cond_lock(nic_access,                         \
                    likely((trans)->ops->grab_nic_access(trans, flags)))

static inline void __releases(nic_access)
iwl_trans_release_nic_access(struct iwl_trans *trans, unsigned long *flags)
{
        trans->ops->release_nic_access(trans, flags);
        __release(nic_access);
}

static inline void iwl_trans_fw_error(struct iwl_trans *trans)
{
        if (WARN_ON_ONCE(!trans->op_mode))
                return;

        /* prevent double restarts due to the same erroneous FW */
        if (!test_and_set_bit(STATUS_FW_ERROR, &trans->status))
                iwl_op_mode_nic_error(trans->op_mode);
}

/*****************************************************
 * transport helper functions
 *****************************************************/
struct iwl_trans *iwl_trans_alloc(unsigned int priv_size,
                                  struct device *dev,
                                  const struct iwl_cfg *cfg,
                                  const struct iwl_trans_ops *ops);
void iwl_trans_free(struct iwl_trans *trans);

/*****************************************************
* driver (transport) register/unregister functions
******************************************************/
int __must_check iwl_pci_register_driver(void);
void iwl_pci_unregister_driver(void);

#endif /* __iwl_trans_h__ */