iwlwifi: handle RFKILL logic in the transport layer

[deliverable/linux.git] / drivers / net / wireless / 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.
 *
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 *
 * Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved.
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 *  Intel Linux Wireless <ilw@linux.intel.com>
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#ifndef __iwl_trans_h__
#define __iwl_trans_h__

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

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

/**
 * DOC: Transport layer - what is it ?
 *
 * The tranport 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_fw (a.k.a. stop device for the moment)
 *         stop_hw
 *
 *      6) Eventually, the free function will be called.
 */

/**
 * DOC: Host command section
 *
 * A host command is a commaned 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 functionnality (i.e. SYNC / ASYNC mode),
 */
#define SEQ_TO_SN(seq) (((seq) & IEEE80211_SCTL_SEQ) >> 4)
#define SN_TO_SEQ(ssn) (((ssn) << 4) & IEEE80211_SCTL_SEQ)
#define MAX_SN ((IEEE80211_SCTL_SEQ) >> 4)
#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)

/**
 * 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 flags;       /* 0:5 reserved, 6 abort, 7 internal */
        /*
         * 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;

/* iwl_cmd_header flags value */
#define IWL_CMD_FAILED_MSK 0x40


#define FH_RSCSR_FRAME_SIZE_MSK         0x00003FFF      /* bits 0-13 */
#define FH_RSCSR_FRAME_INVALID          0x55550000
#define FH_RSCSR_FRAME_ALIGN            0x40

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
         * 28-14: Reserved
         * 13-00: RX frame size
         */
        __le32 len_n_flags;
        struct iwl_cmd_header hdr;
        u8 data[];
} __packed;

/**
 * enum CMD_MODE - how to send the host commands ?
 *
 * @CMD_SYNC: The caller will be stalled until the fw responds to the command
 * @CMD_ASYNC: Return right away and don't want for the response
 * @CMD_WANT_SKB: valid only with CMD_SYNC. The caller needs the buffer of the
 *      response. The caller needs to call iwl_free_resp when done.
 * @CMD_WANT_HCMD: The caller needs to get the HCMD that was sent in the
 *      response handler. Chunks flagged by %IWL_HCMD_DFL_NOCOPY won't be
 *      copied. The pointer passed to the response handler is in the transport
 *      ownership and don't need to be freed by the op_mode. This also means
 *      that the pointer is invalidated after the op_mode's handler returns.
 * @CMD_ON_DEMAND: This command is sent by the test mode pipe.
 */
enum CMD_MODE {
        CMD_SYNC = 0,
        CMD_ASYNC = BIT(0),
        CMD_WANT_SKB = BIT(1),
        CMD_WANT_HCMD = BIT(2),
        CMD_ON_DEMAND = BIT(3),
};

#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 {
        struct iwl_cmd_header hdr;      /* uCode API */
        u8 payload[DEF_CMD_PAYLOAD_SIZE];
} __packed;

#define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_device_cmd))

#define IWL_MAX_CMD_TFDS        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 an 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)
 * @handler_status: return value of the handler of the command
 *      (put in setup_rx_handlers) - valid for SYNC mode only
 * @flags: can be CMD_*
 * @len: array of the lenths of the chunks in data
 * @dataflags: IWL_HCMD_DFL_*
 * @id: id of the host command
 */
struct iwl_host_cmd {
        const void *data[IWL_MAX_CMD_TFDS];
        struct iwl_rx_packet *resp_pkt;
        unsigned long _rx_page_addr;
        u32 _rx_page_order;
        int handler_status;

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

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;
        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;
}

#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_INVALID_STATION     255
#define IWL_MAX_TID_COUNT       8
#define IWL_FRAME_LIMIT 64

/**
 * 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
 * @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_8k: 8 kB RX buffer size needed for A-MSDUs,
 *      if unset 4k will be the RX buffer size
 * @queue_watchdog_timeout: time (in ms) after which queues
 *      are considered stuck and will trigger device restart
 * @command_names: array of command names, must be 256 entries
 *      (one for each command); for debugging only
 */
struct iwl_trans_config {
        struct iwl_op_mode *op_mode;

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

        bool rx_buf_size_8k;
        unsigned int queue_watchdog_timeout;
        const char **command_names;
};

struct iwl_trans;

/**
 * struct iwl_trans_ops - transport specific operations
 *
 * All the handlers MUST be implemented
 *
 * @start_hw: starts the HW- from that point on, the HW can send interrupts
 *      May sleep
 * @stop_hw: stops the HW- from that point on, the HW will be in low power but
 *      will still issue interrupt if the HW RF kill is triggered unless
 *      op_mode_leaving is true.
 *      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
 *      May sleep
 * @stop_device:stops the whole device (embedded CPU put to reset)
 *      May sleep
 * @wowlan_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.
 * @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_SYNC is set
 * @tx: send an skb
 *      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. May sleep.
 * @txq_disable: de-configure a Tx queue to send AMPDUs
 *      Must be atomic
 * @wait_tx_queue_empty: wait until all tx queues are empty
 *      May sleep
 * @dbgfs_register: add the dbgfs files under this directory. Files will be
 *      automatically deleted.
 * @suspend: stop the device unless WoWLAN is configured
 * @resume: resume activity of the device
 * @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
 * @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
 */
struct iwl_trans_ops {

        int (*start_hw)(struct iwl_trans *iwl_trans);
        void (*stop_hw)(struct iwl_trans *iwl_trans, bool op_mode_leaving);
        int (*start_fw)(struct iwl_trans *trans, const struct fw_img *fw);
        void (*fw_alive)(struct iwl_trans *trans);
        void (*stop_device)(struct iwl_trans *trans);

        void (*wowlan_suspend)(struct iwl_trans *trans);

        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, int fifo,
                           int sta_id, int tid, int frame_limit, u16 ssn);
        void (*txq_disable)(struct iwl_trans *trans, int queue);

        int (*dbgfs_register)(struct iwl_trans *trans, struct dentry* dir);
        int (*wait_tx_queue_empty)(struct iwl_trans *trans);
#ifdef CONFIG_PM_SLEEP
        int (*suspend)(struct iwl_trans *trans);
        int (*resume)(struct iwl_trans *trans);
#endif
        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);
        void (*configure)(struct iwl_trans *trans,
                          const struct iwl_trans_config *trans_cfg);
        void (*set_pmi)(struct iwl_trans *trans, bool state);
};

/**
 * 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,
};

/**
 * struct iwl_trans - transport common data
 *
 * @ops - pointer to iwl_trans_ops
 * @op_mode - pointer to the op_mode
 * @cfg - pointer to the configuration
 * @reg_lock - protect hw register access
 * @dev - pointer to struct device * that represents the device
 * @hw_id: a u32 with the ID of the device / subdevice.
 *      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
 * @dev_cmd_pool: pool for Tx cmd allocation - for internal use only.
 *      The user should use iwl_trans_{alloc,free}_tx_cmd.
 * @dev_cmd_headroom: room needed for the transport's private use before the
 *      device_cmd for Tx - 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
 */
struct iwl_trans {
        const struct iwl_trans_ops *ops;
        struct iwl_op_mode *op_mode;
        const struct iwl_cfg *cfg;
        enum iwl_trans_state state;
        spinlock_t reg_lock;

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

        u8 rx_mpdu_cmd, rx_mpdu_cmd_hdr_size;

        bool pm_support;

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

        struct dentry *dbgfs_dir;

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

static inline void iwl_trans_configure(struct iwl_trans *trans,
                                       const struct iwl_trans_config *trans_cfg)
{
        /*
         * only set the op_mode for the moment. Later on, this function will do
         * more
         */
        trans->op_mode = trans_cfg->op_mode;

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

static inline int iwl_trans_start_hw(struct iwl_trans *trans)
{
        might_sleep();

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

static inline void iwl_trans_stop_hw(struct iwl_trans *trans,
                                     bool op_mode_leaving)
{
        might_sleep();

        trans->ops->stop_hw(trans, op_mode_leaving);

        trans->state = IWL_TRANS_NO_FW;
}

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

        trans->state = IWL_TRANS_FW_ALIVE;

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

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

        WARN_ON_ONCE(!trans->rx_mpdu_cmd);

        return trans->ops->start_fw(trans, fw);
}

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

        trans->ops->stop_device(trans);

        trans->state = IWL_TRANS_NO_FW;
}

static inline void iwl_trans_wowlan_suspend(struct iwl_trans *trans)
{
        might_sleep();
        trans->ops->wowlan_suspend(trans);
}

static inline int iwl_trans_send_cmd(struct iwl_trans *trans,
                                struct iwl_host_cmd *cmd)
{
        WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
                  "%s bad state = %d", __func__, trans->state);

        return trans->ops->send_cmd(trans, cmd);
}

static inline struct iwl_device_cmd *
iwl_trans_alloc_tx_cmd(struct iwl_trans *trans)
{
        u8 *dev_cmd_ptr = kmem_cache_alloc(trans->dev_cmd_pool, GFP_ATOMIC);

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

        return (struct iwl_device_cmd *)
                        (dev_cmd_ptr + trans->dev_cmd_headroom);
}

static inline void iwl_trans_free_tx_cmd(struct iwl_trans *trans,
                                         struct iwl_device_cmd *dev_cmd)
{
        u8 *dev_cmd_ptr = (u8 *)dev_cmd - trans->dev_cmd_headroom;

        kmem_cache_free(trans->dev_cmd_pool, dev_cmd_ptr);
}

static inline int iwl_trans_tx(struct iwl_trans *trans, struct sk_buff *skb,
                               struct iwl_device_cmd *dev_cmd, int queue)
{
        WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
                  "%s bad state = %d", __func__, trans->state);

        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)
{
        WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
                  "%s bad state = %d", __func__, trans->state);

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

static inline void iwl_trans_txq_disable(struct iwl_trans *trans, int queue)
{
        WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
                  "%s bad state = %d", __func__, trans->state);

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

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)
{
        might_sleep();

        WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
                  "%s bad state = %d", __func__, trans->state);

        trans->ops->txq_enable(trans, queue, fifo, sta_id, tid,
                                 frame_limit, ssn);
}

static inline void iwl_trans_ac_txq_enable(struct iwl_trans *trans, int queue,
                                           int fifo)
{
        iwl_trans_txq_enable(trans, queue, fifo, IWL_INVALID_STATION,
                             IWL_MAX_TID_COUNT, IWL_FRAME_LIMIT, 0);
}

static inline int iwl_trans_wait_tx_queue_empty(struct iwl_trans *trans)
{
        WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
                  "%s bad state = %d", __func__, trans->state);

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

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);
}

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

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

#endif /* __iwl_trans_h__ */