drivers/net/wireless/iwlwifi/iwl-trans.h

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  63 #ifndef __iwl_trans_h__
  64 #define __iwl_trans_h__
  65
  66 #include <linux/ieee80211.h>
  67 #include <linux/mm.h> /* for page_address */
  68 #include <linux/lockdep.h>
  69
  70 #include "iwl-debug.h"
  71 #include "iwl-config.h"
  72 #include "iwl-fw.h"
  73
  74 /**
  75  * DOC: Transport layer - what is it ?
  76  *
  77  * The tranport layer is the layer that deals with the HW directly. It provides
  78  * an abstraction of the underlying HW to the upper layer. The transport layer
  79  * doesn't provide any policy, algorithm or anything of this kind, but only
  80  * mechanisms to make the HW do something.It is not completely stateless but
  81  * close to it.
  82  * We will have an implementation for each different supported bus.
  83  */
  84
  85 /**
  86  * DOC: Life cycle of the transport layer
  87  *
  88  * The transport layer has a very precise life cycle.
  89  *
  90  *      1) A helper function is called during the module initialization and
  91  *         registers the bus driver's ops with the transport's alloc function.
  92  *      2) Bus's probe calls to the transport layer's allocation functions.
  93  *         Of course this function is bus specific.
  94  *      3) This allocation functions will spawn the upper layer which will
  95  *         register mac80211.
  96  *
  97  *      4) At some point (i.e. mac80211's start call), the op_mode will call
  98  *         the following sequence:
  99  *         start_hw
 100  *         start_fw
 101  *
 102  *      5) Then when finished (or reset):
 103  *         stop_fw (a.k.a. stop device for the moment)
 104  *         stop_hw
 105  *
 106  *      6) Eventually, the free function will be called.
 107  */
 108
 109 /**
 110  * DOC: Host command section
 111  *
 112  * A host command is a commaned issued by the upper layer to the fw. There are
 113  * several versions of fw that have several APIs. The transport layer is
 114  * completely agnostic to these differences.
 115  * The transport does provide helper functionnality (i.e. SYNC / ASYNC mode),
 116  */
 117 #define SEQ_TO_SN(seq) (((seq) & IEEE80211_SCTL_SEQ) >> 4)
 118 #define SN_TO_SEQ(ssn) (((ssn) << 4) & IEEE80211_SCTL_SEQ)
 119 #define MAX_SN ((IEEE80211_SCTL_SEQ) >> 4)
 120 #define SEQ_TO_QUEUE(s) (((s) >> 8) & 0x1f)
 121 #define QUEUE_TO_SEQ(q) (((q) & 0x1f) << 8)
 122 #define SEQ_TO_INDEX(s) ((s) & 0xff)
 123 #define INDEX_TO_SEQ(i) ((i) & 0xff)
 124 #define SEQ_RX_FRAME    cpu_to_le16(0x8000)
 125
 126 /**
 127  * struct iwl_cmd_header
 128  *
 129  * This header format appears in the beginning of each command sent from the
 130  * driver, and each response/notification received from uCode.
 131  */
 132 struct iwl_cmd_header {
 133         u8 cmd;         /* Command ID:  REPLY_RXON, etc. */
 134         u8 flags;       /* 0:5 reserved, 6 abort, 7 internal */
 135         /*
 136          * The driver sets up the sequence number to values of its choosing.
 137          * uCode does not use this value, but passes it back to the driver
 138          * when sending the response to each driver-originated command, so
 139          * the driver can match the response to the command.  Since the values
 140          * don't get used by uCode, the driver may set up an arbitrary format.
 141          *
 142          * There is one exception:  uCode sets bit 15 when it originates
 143          * the response/notification, i.e. when the response/notification
 144          * is not a direct response to a command sent by the driver.  For
 145          * example, uCode issues REPLY_RX when it sends a received frame
 146          * to the driver; it is not a direct response to any driver command.
 147          *
 148          * The Linux driver uses the following format:
 149          *
 150          *  0:7         tfd index - position within TX queue
 151          *  8:12        TX queue id
 152          *  13:14       reserved
 153          *  15          unsolicited RX or uCode-originated notification
 154          */
 155         __le16 sequence;
 156 } __packed;
 157
 158 /* iwl_cmd_header flags value */
 159 #define IWL_CMD_FAILED_MSK 0x40
 160
 161
 162 #define FH_RSCSR_FRAME_SIZE_MSK         0x00003FFF      /* bits 0-13 */
 163 #define FH_RSCSR_FRAME_INVALID          0x55550000
 164 #define FH_RSCSR_FRAME_ALIGN            0x40
 165
 166 struct iwl_rx_packet {
 167         /*
 168          * The first 4 bytes of the RX frame header contain both the RX frame
 169          * size and some flags.
 170          * Bit fields:
 171          * 31:    flag flush RB request
 172          * 30:    flag ignore TC (terminal counter) request
 173          * 29:    flag fast IRQ request
 174          * 28-14: Reserved
 175          * 13-00: RX frame size
 176          */
 177         __le32 len_n_flags;
 178         struct iwl_cmd_header hdr;
 179         u8 data[];
 180 } __packed;
 181
 182 /**
 183  * enum CMD_MODE - how to send the host commands ?
 184  *
 185  * @CMD_SYNC: The caller will be stalled until the fw responds to the command
 186  * @CMD_ASYNC: Return right away and don't want for the response
 187  * @CMD_WANT_SKB: valid only with CMD_SYNC. The caller needs the buffer of the
 188  *      response. The caller needs to call iwl_free_resp when done.
 189  * @CMD_WANT_HCMD: The caller needs to get the HCMD that was sent in the
 190  *      response handler. Chunks flagged by %IWL_HCMD_DFL_NOCOPY won't be
 191  *      copied. The pointer passed to the response handler is in the transport
 192  *      ownership and don't need to be freed by the op_mode. This also means
 193  *      that the pointer is invalidated after the op_mode's handler returns.
 194  * @CMD_ON_DEMAND: This command is sent by the test mode pipe.
 195  */
 196 enum CMD_MODE {
 197         CMD_SYNC                = 0,
 198         CMD_ASYNC               = BIT(0),
 199         CMD_WANT_SKB            = BIT(1),
 200         CMD_WANT_HCMD           = BIT(2),
 201         CMD_ON_DEMAND           = BIT(3),
 202 };
 203
 204 #define DEF_CMD_PAYLOAD_SIZE 320
 205
 206 /**
 207  * struct iwl_device_cmd
 208  *
 209  * For allocation of the command and tx queues, this establishes the overall
 210  * size of the largest command we send to uCode, except for commands that
 211  * aren't fully copied and use other TFD space.
 212  */
 213 struct iwl_device_cmd {
 214         struct iwl_cmd_header hdr;      /* uCode API */
 215         u8 payload[DEF_CMD_PAYLOAD_SIZE];
 216 } __packed;
 217
 218 #define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_device_cmd))
 219
 220 #define IWL_MAX_CMD_TFDS        2
 221
 222 /**
 223  * struct iwl_hcmd_dataflag - flag for each one of the chunks of the command
 224  *
 225  * @IWL_HCMD_DFL_NOCOPY: By default, the command is copied to the host command's
 226  *      ring. The transport layer doesn't map the command's buffer to DMA, but
 227  *      rather copies it to an previously allocated DMA buffer. This flag tells
 228  *      the transport layer not to copy the command, but to map the existing
 229  *      buffer (that is passed in) instead. This saves the memcpy and allows
 230  *      commands that are bigger than the fixed buffer to be submitted.
 231  *      Note that a TFD entry after a NOCOPY one cannot be a normal copied one.
 232  * @IWL_HCMD_DFL_DUP: Only valid without NOCOPY, duplicate the memory for this
 233  *      chunk internally and free it again after the command completes. This
 234  *      can (currently) be used only once per command.
 235  *      Note that a TFD entry after a DUP one cannot be a normal copied one.
 236  */
 237 enum iwl_hcmd_dataflag {
 238         IWL_HCMD_DFL_NOCOPY     = BIT(0),
 239         IWL_HCMD_DFL_DUP        = BIT(1),
 240 };
 241
 242 /**
 243  * struct iwl_host_cmd - Host command to the uCode
 244  *
 245  * @data: array of chunks that composes the data of the host command
 246  * @resp_pkt: response packet, if %CMD_WANT_SKB was set
 247  * @_rx_page_order: (internally used to free response packet)
 248  * @_rx_page_addr: (internally used to free response packet)
 249  * @handler_status: return value of the handler of the command
 250  *      (put in setup_rx_handlers) - valid for SYNC mode only
 251  * @flags: can be CMD_*
 252  * @len: array of the lenths of the chunks in data
 253  * @dataflags: IWL_HCMD_DFL_*
 254  * @id: id of the host command
 255  */
 256 struct iwl_host_cmd {
 257         const void *data[IWL_MAX_CMD_TFDS];
 258         struct iwl_rx_packet *resp_pkt;
 259         unsigned long _rx_page_addr;
 260         u32 _rx_page_order;
 261         int handler_status;
 262
 263         u32 flags;
 264         u16 len[IWL_MAX_CMD_TFDS];
 265         u8 dataflags[IWL_MAX_CMD_TFDS];
 266         u8 id;
 267 };
 268
 269 static inline void iwl_free_resp(struct iwl_host_cmd *cmd)
 270 {
 271         free_pages(cmd->_rx_page_addr, cmd->_rx_page_order);
 272 }
 273
 274 struct iwl_rx_cmd_buffer {
 275         struct page *_page;
 276         int _offset;
 277         bool _page_stolen;
 278         u32 _rx_page_order;
 279         unsigned int truesize;
 280 };
 281
 282 static inline void *rxb_addr(struct iwl_rx_cmd_buffer *r)
 283 {
 284         return (void *)((unsigned long)page_address(r->_page) + r->_offset);
 285 }
 286
 287 static inline int rxb_offset(struct iwl_rx_cmd_buffer *r)
 288 {
 289         return r->_offset;
 290 }
 291
 292 static inline struct page *rxb_steal_page(struct iwl_rx_cmd_buffer *r)
 293 {
 294         r->_page_stolen = true;
 295         get_page(r->_page);
 296         return r->_page;
 297 }
 298
 299 static inline void iwl_free_rxb(struct iwl_rx_cmd_buffer *r)
 300 {
 301         __free_pages(r->_page, r->_rx_page_order);
 302 }
 303
 304 #define MAX_NO_RECLAIM_CMDS     6
 305
 306 #define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))
 307
 308 /*
 309  * Maximum number of HW queues the transport layer
 310  * currently supports
 311  */
 312 #define IWL_MAX_HW_QUEUES               32
 313 #define IWL_INVALID_STATION     255
 314 #define IWL_MAX_TID_COUNT       8
 315 #define IWL_FRAME_LIMIT 64
 316
 317 /**
 318  * enum iwl_wowlan_status - WoWLAN image/device status
 319  * @IWL_D3_STATUS_ALIVE: firmware is still running after resume
 320  * @IWL_D3_STATUS_RESET: device was reset while suspended
 321  */
 322 enum iwl_d3_status {
 323         IWL_D3_STATUS_ALIVE,
 324         IWL_D3_STATUS_RESET,
 325 };
 326
 327 /**
 328  * struct iwl_trans_config - transport configuration
 329  *
 330  * @op_mode: pointer to the upper layer.
 331  * @cmd_queue: the index of the command queue.
 332  *      Must be set before start_fw.
 333  * @cmd_fifo: the fifo for host commands
 334  * @no_reclaim_cmds: Some devices erroneously don't set the
 335  *      SEQ_RX_FRAME bit on some notifications, this is the
 336  *      list of such notifications to filter. Max length is
 337  *      %MAX_NO_RECLAIM_CMDS.
 338  * @n_no_reclaim_cmds: # of commands in list
 339  * @rx_buf_size_8k: 8 kB RX buffer size needed for A-MSDUs,
 340  *      if unset 4k will be the RX buffer size
 341  * @bc_table_dword: set to true if the BC table expects the byte count to be
 342  *      in DWORD (as opposed to bytes)
 343  * @queue_watchdog_timeout: time (in ms) after which queues
 344  *      are considered stuck and will trigger device restart
 345  * @command_names: array of command names, must be 256 entries
 346  *      (one for each command); for debugging only
 347  */
 348 struct iwl_trans_config {
 349         struct iwl_op_mode *op_mode;
 350
 351         u8 cmd_queue;
 352         u8 cmd_fifo;
 353         const u8 *no_reclaim_cmds;
 354         int n_no_reclaim_cmds;
 355
 356         bool rx_buf_size_8k;
 357         bool bc_table_dword;
 358         unsigned int queue_watchdog_timeout;
 359         const char **command_names;
 360 };
 361
 362 struct iwl_trans;
 363
 364 /**
 365  * struct iwl_trans_ops - transport specific operations
 366  *
 367  * All the handlers MUST be implemented
 368  *
 369  * @start_hw: starts the HW- from that point on, the HW can send interrupts
 370  *      May sleep
 371  * @stop_hw: stops the HW- from that point on, the HW will be in low power but
 372  *      will still issue interrupt if the HW RF kill is triggered unless
 373  *      op_mode_leaving is true.
 374  *      May sleep
 375  * @start_fw: allocates and inits all the resources for the transport
 376  *      layer. Also kick a fw image.
 377  *      May sleep
 378  * @fw_alive: called when the fw sends alive notification. If the fw provides
 379  *      the SCD base address in SRAM, then provide it here, or 0 otherwise.
 380  *      May sleep
 381  * @stop_device:stops the whole device (embedded CPU put to reset)
 382  *      May sleep
 383  * @d3_suspend: put the device into the correct mode for WoWLAN during
 384  *      suspend. This is optional, if not implemented WoWLAN will not be
 385  *      supported. This callback may sleep.
 386  * @d3_resume: resume the device after WoWLAN, enabling the opmode to
 387  *      talk to the WoWLAN image to get its status. This is optional, if not
 388  *      implemented WoWLAN will not be supported. This callback may sleep.
 389  * @send_cmd:send a host command. Must return -ERFKILL if RFkill is asserted.
 390  *      If RFkill is asserted in the middle of a SYNC host command, it must
 391  *      return -ERFKILL straight away.
 392  *      May sleep only if CMD_SYNC is set
 393  * @tx: send an skb
 394  *      Must be atomic
 395  * @reclaim: free packet until ssn. Returns a list of freed packets.
 396  *      Must be atomic
 397  * @txq_enable: setup a queue. To setup an AC queue, use the
 398  *      iwl_trans_ac_txq_enable wrapper. fw_alive must have been called before
 399  *      this one. The op_mode must not configure the HCMD queue. May sleep.
 400  * @txq_disable: de-configure a Tx queue to send AMPDUs
 401  *      Must be atomic
 402  * @wait_tx_queue_empty: wait until all tx queues are empty
 403  *      May sleep
 404  * @dbgfs_register: add the dbgfs files under this directory. Files will be
 405  *      automatically deleted.
 406  * @suspend: stop the device unless WoWLAN is configured
 407  * @resume: resume activity of the device
 408  * @write8: write a u8 to a register at offset ofs from the BAR
 409  * @write32: write a u32 to a register at offset ofs from the BAR
 410  * @read32: read a u32 register at offset ofs from the BAR
 411  * @read_prph: read a DWORD from a periphery register
 412  * @write_prph: write a DWORD to a periphery register
 413  * @read_mem: read device's SRAM in DWORD
 414  * @write_mem: write device's SRAM in DWORD. If %buf is %NULL, then the memory
 415  *      will be zeroed.
 416  * @configure: configure parameters required by the transport layer from
 417  *      the op_mode. May be called several times before start_fw, can't be
 418  *      called after that.
 419  * @set_pmi: set the power pmi state
 420  * @grab_nic_access: wake the NIC to be able to access non-HBUS regs.
 421  *      Sleeping is not allowed between grab_nic_access and
 422  *      release_nic_access.
 423  * @release_nic_access: let the NIC go to sleep. The "flags" parameter
 424  *      must be the same one that was sent before to the grab_nic_access.
 425  * @set_bits_mask - set SRAM register according to value and mask.
 426  */
 427 struct iwl_trans_ops {
 428
 429         int (*start_hw)(struct iwl_trans *iwl_trans);
 430         void (*stop_hw)(struct iwl_trans *iwl_trans, bool op_mode_leaving);
 431         int (*start_fw)(struct iwl_trans *trans, const struct fw_img *fw,
 432                         bool run_in_rfkill);
 433         void (*fw_alive)(struct iwl_trans *trans, u32 scd_addr);
 434         void (*stop_device)(struct iwl_trans *trans);
 435
 436         void (*d3_suspend)(struct iwl_trans *trans);
 437         int (*d3_resume)(struct iwl_trans *trans, enum iwl_d3_status *status);
 438
 439         int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
 440
 441         int (*tx)(struct iwl_trans *trans, struct sk_buff *skb,
 442                   struct iwl_device_cmd *dev_cmd, int queue);
 443         void (*reclaim)(struct iwl_trans *trans, int queue, int ssn,
 444                         struct sk_buff_head *skbs);
 445
 446         void (*txq_enable)(struct iwl_trans *trans, int queue, int fifo,
 447                            int sta_id, int tid, int frame_limit, u16 ssn);
 448         void (*txq_disable)(struct iwl_trans *trans, int queue);
 449
 450         int (*dbgfs_register)(struct iwl_trans *trans, struct dentry* dir);
 451         int (*wait_tx_queue_empty)(struct iwl_trans *trans);
 452 #ifdef CONFIG_PM_SLEEP
 453         int (*suspend)(struct iwl_trans *trans);
 454         int (*resume)(struct iwl_trans *trans);
 455 #endif
 456         void (*write8)(struct iwl_trans *trans, u32 ofs, u8 val);
 457         void (*write32)(struct iwl_trans *trans, u32 ofs, u32 val);
 458         u32 (*read32)(struct iwl_trans *trans, u32 ofs);
 459         u32 (*read_prph)(struct iwl_trans *trans, u32 ofs);
 460         void (*write_prph)(struct iwl_trans *trans, u32 ofs, u32 val);
 461         int (*read_mem)(struct iwl_trans *trans, u32 addr,
 462                         void *buf, int dwords);
 463         int (*write_mem)(struct iwl_trans *trans, u32 addr,
 464                          void *buf, int dwords);
 465         void (*configure)(struct iwl_trans *trans,
 466                           const struct iwl_trans_config *trans_cfg);
 467         void (*set_pmi)(struct iwl_trans *trans, bool state);
 468         bool (*grab_nic_access)(struct iwl_trans *trans, bool silent,
 469                                 unsigned long *flags);
 470         void (*release_nic_access)(struct iwl_trans *trans,
 471                                    unsigned long *flags);
 472         void (*set_bits_mask)(struct iwl_trans *trans, u32 reg, u32 mask,
 473                               u32 value);
 474 };
 475
 476 /**
 477  * enum iwl_trans_state - state of the transport layer
 478  *
 479  * @IWL_TRANS_NO_FW: no fw has sent an alive response
 480  * @IWL_TRANS_FW_ALIVE: a fw has sent an alive response
 481  */
 482 enum iwl_trans_state {
 483         IWL_TRANS_NO_FW = 0,
 484         IWL_TRANS_FW_ALIVE      = 1,
 485 };
 486
 487 /**
 488  * struct iwl_trans - transport common data
 489  *
 490  * @ops - pointer to iwl_trans_ops
 491  * @op_mode - pointer to the op_mode
 492  * @cfg - pointer to the configuration
 493  * @dev - pointer to struct device * that represents the device
 494  * @hw_id: a u32 with the ID of the device / subdevice.
 495  *      Set during transport allocation.
 496  * @hw_id_str: a string with info about HW ID. Set during transport allocation.
 497  * @pm_support: set to true in start_hw if link pm is supported
 498  * @dev_cmd_pool: pool for Tx cmd allocation - for internal use only.
 499  *      The user should use iwl_trans_{alloc,free}_tx_cmd.
 500  * @dev_cmd_headroom: room needed for the transport's private use before the
 501  *      device_cmd for Tx - for internal use only
 502  *      The user should use iwl_trans_{alloc,free}_tx_cmd.
 503  * @rx_mpdu_cmd: MPDU RX command ID, must be assigned by opmode before
 504  *      starting the firmware, used for tracing
 505  * @rx_mpdu_cmd_hdr_size: used for tracing, amount of data before the
 506  *      start of the 802.11 header in the @rx_mpdu_cmd
 507  */
 508 struct iwl_trans {
 509         const struct iwl_trans_ops *ops;
 510         struct iwl_op_mode *op_mode;
 511         const struct iwl_cfg *cfg;
 512         enum iwl_trans_state state;
 513
 514         struct device *dev;
 515         u32 hw_rev;
 516         u32 hw_id;
 517         char hw_id_str[52];
 518
 519         u8 rx_mpdu_cmd, rx_mpdu_cmd_hdr_size;
 520
 521         bool pm_support;
 522
 523         /* The following fields are internal only */
 524         struct kmem_cache *dev_cmd_pool;
 525         size_t dev_cmd_headroom;
 526         char dev_cmd_pool_name[50];
 527
 528         struct dentry *dbgfs_dir;
 529
 530 #ifdef CONFIG_LOCKDEP
 531         struct lockdep_map sync_cmd_lockdep_map;
 532 #endif
 533
 534         /* pointer to trans specific struct */
 535         /*Ensure that this pointer will always be aligned to sizeof pointer */
 536         char trans_specific[0] __aligned(sizeof(void *));
 537 };
 538
 539 static inline void iwl_trans_configure(struct iwl_trans *trans,
 540                                        const struct iwl_trans_config *trans_cfg)
 541 {
 542         trans->op_mode = trans_cfg->op_mode;
 543
 544         trans->ops->configure(trans, trans_cfg);
 545 }
 546
 547 static inline int iwl_trans_start_hw(struct iwl_trans *trans)
 548 {
 549         might_sleep();
 550
 551         return trans->ops->start_hw(trans);
 552 }
 553
 554 static inline void iwl_trans_stop_hw(struct iwl_trans *trans,
 555                                      bool op_mode_leaving)
 556 {
 557         might_sleep();
 558
 559         trans->ops->stop_hw(trans, op_mode_leaving);
 560
 561         if (op_mode_leaving)
 562                 trans->op_mode = NULL;
 563
 564         trans->state = IWL_TRANS_NO_FW;
 565 }
 566
 567 static inline void iwl_trans_fw_alive(struct iwl_trans *trans, u32 scd_addr)
 568 {
 569         might_sleep();
 570
 571         trans->state = IWL_TRANS_FW_ALIVE;
 572
 573         trans->ops->fw_alive(trans, scd_addr);
 574 }
 575
 576 static inline int iwl_trans_start_fw(struct iwl_trans *trans,
 577                                      const struct fw_img *fw,
 578                                      bool run_in_rfkill)
 579 {
 580         might_sleep();
 581
 582         WARN_ON_ONCE(!trans->rx_mpdu_cmd);
 583
 584         return trans->ops->start_fw(trans, fw, run_in_rfkill);
 585 }
 586
 587 static inline void iwl_trans_stop_device(struct iwl_trans *trans)
 588 {
 589         might_sleep();
 590
 591         trans->ops->stop_device(trans);
 592
 593         trans->state = IWL_TRANS_NO_FW;
 594 }
 595
 596 static inline void iwl_trans_d3_suspend(struct iwl_trans *trans)
 597 {
 598         might_sleep();
 599         trans->ops->d3_suspend(trans);
 600 }
 601
 602 static inline int iwl_trans_d3_resume(struct iwl_trans *trans,
 603                                       enum iwl_d3_status *status)
 604 {
 605         might_sleep();
 606         return trans->ops->d3_resume(trans, status);
 607 }
 608
 609 static inline int iwl_trans_send_cmd(struct iwl_trans *trans,
 610                                      struct iwl_host_cmd *cmd)
 611 {
 612         int ret;
 613
 614         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 615                   "%s bad state = %d", __func__, trans->state);
 616
 617         if (!(cmd->flags & CMD_ASYNC))
 618                 lock_map_acquire_read(&trans->sync_cmd_lockdep_map);
 619
 620         ret = trans->ops->send_cmd(trans, cmd);
 621
 622         if (!(cmd->flags & CMD_ASYNC))
 623                 lock_map_release(&trans->sync_cmd_lockdep_map);
 624
 625         return ret;
 626 }
 627
 628 static inline struct iwl_device_cmd *
 629 iwl_trans_alloc_tx_cmd(struct iwl_trans *trans)
 630 {
 631         u8 *dev_cmd_ptr = kmem_cache_alloc(trans->dev_cmd_pool, GFP_ATOMIC);
 632
 633         if (unlikely(dev_cmd_ptr == NULL))
 634                 return NULL;
 635
 636         return (struct iwl_device_cmd *)
 637                         (dev_cmd_ptr + trans->dev_cmd_headroom);
 638 }
 639
 640 static inline void iwl_trans_free_tx_cmd(struct iwl_trans *trans,
 641                                          struct iwl_device_cmd *dev_cmd)
 642 {
 643         u8 *dev_cmd_ptr = (u8 *)dev_cmd - trans->dev_cmd_headroom;
 644
 645         kmem_cache_free(trans->dev_cmd_pool, dev_cmd_ptr);
 646 }
 647
 648 static inline int iwl_trans_tx(struct iwl_trans *trans, struct sk_buff *skb,
 649                                struct iwl_device_cmd *dev_cmd, int queue)
 650 {
 651         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 652                   "%s bad state = %d", __func__, trans->state);
 653
 654         return trans->ops->tx(trans, skb, dev_cmd, queue);
 655 }
 656
 657 static inline void iwl_trans_reclaim(struct iwl_trans *trans, int queue,
 658                                      int ssn, struct sk_buff_head *skbs)
 659 {
 660         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 661                   "%s bad state = %d", __func__, trans->state);
 662
 663         trans->ops->reclaim(trans, queue, ssn, skbs);
 664 }
 665
 666 static inline void iwl_trans_txq_disable(struct iwl_trans *trans, int queue)
 667 {
 668         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 669                   "%s bad state = %d", __func__, trans->state);
 670
 671         trans->ops->txq_disable(trans, queue);
 672 }
 673
 674 static inline void iwl_trans_txq_enable(struct iwl_trans *trans, int queue,
 675                                         int fifo, int sta_id, int tid,
 676                                         int frame_limit, u16 ssn)
 677 {
 678         might_sleep();
 679
 680         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 681                   "%s bad state = %d", __func__, trans->state);
 682
 683         trans->ops->txq_enable(trans, queue, fifo, sta_id, tid,
 684                                  frame_limit, ssn);
 685 }
 686
 687 static inline void iwl_trans_ac_txq_enable(struct iwl_trans *trans, int queue,
 688                                            int fifo)
 689 {
 690         iwl_trans_txq_enable(trans, queue, fifo, IWL_INVALID_STATION,
 691                              IWL_MAX_TID_COUNT, IWL_FRAME_LIMIT, 0);
 692 }
 693
 694 static inline int iwl_trans_wait_tx_queue_empty(struct iwl_trans *trans)
 695 {
 696         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 697                   "%s bad state = %d", __func__, trans->state);
 698
 699         return trans->ops->wait_tx_queue_empty(trans);
 700 }
 701
 702 static inline int iwl_trans_dbgfs_register(struct iwl_trans *trans,
 703                                            struct dentry *dir)
 704 {
 705         return trans->ops->dbgfs_register(trans, dir);
 706 }
 707
 708 #ifdef CONFIG_PM_SLEEP
 709 static inline int iwl_trans_suspend(struct iwl_trans *trans)
 710 {
 711         return trans->ops->suspend(trans);
 712 }
 713
 714 static inline int iwl_trans_resume(struct iwl_trans *trans)
 715 {
 716         return trans->ops->resume(trans);
 717 }
 718 #endif
 719
 720 static inline void iwl_trans_write8(struct iwl_trans *trans, u32 ofs, u8 val)
 721 {
 722         trans->ops->write8(trans, ofs, val);
 723 }
 724
 725 static inline void iwl_trans_write32(struct iwl_trans *trans, u32 ofs, u32 val)
 726 {
 727         trans->ops->write32(trans, ofs, val);
 728 }
 729
 730 static inline u32 iwl_trans_read32(struct iwl_trans *trans, u32 ofs)
 731 {
 732         return trans->ops->read32(trans, ofs);
 733 }
 734
 735 static inline u32 iwl_trans_read_prph(struct iwl_trans *trans, u32 ofs)
 736 {
 737         return trans->ops->read_prph(trans, ofs);
 738 }
 739
 740 static inline void iwl_trans_write_prph(struct iwl_trans *trans, u32 ofs,
 741                                         u32 val)
 742 {
 743         return trans->ops->write_prph(trans, ofs, val);
 744 }
 745
 746 static inline int iwl_trans_read_mem(struct iwl_trans *trans, u32 addr,
 747                                      void *buf, int dwords)
 748 {
 749         return trans->ops->read_mem(trans, addr, buf, dwords);
 750 }
 751
 752 #define iwl_trans_read_mem_bytes(trans, addr, buf, bufsize)                   \
 753         do {                                                                  \
 754                 if (__builtin_constant_p(bufsize))                            \
 755                         BUILD_BUG_ON((bufsize) % sizeof(u32));                \
 756                 iwl_trans_read_mem(trans, addr, buf, (bufsize) / sizeof(u32));\
 757         } while (0)
 758
 759 static inline u32 iwl_trans_read_mem32(struct iwl_trans *trans, u32 addr)
 760 {
 761         u32 value;
 762
 763         if (WARN_ON(iwl_trans_read_mem(trans, addr, &value, 1)))
 764                 return 0xa5a5a5a5;
 765
 766         return value;
 767 }
 768
 769 static inline int iwl_trans_write_mem(struct iwl_trans *trans, u32 addr,
 770                                       void *buf, int dwords)
 771 {
 772         return trans->ops->write_mem(trans, addr, buf, dwords);
 773 }
 774
 775 static inline u32 iwl_trans_write_mem32(struct iwl_trans *trans, u32 addr,
 776                                         u32 val)
 777 {
 778         return iwl_trans_write_mem(trans, addr, &val, 1);
 779 }
 780
 781 static inline void iwl_trans_set_pmi(struct iwl_trans *trans, bool state)
 782 {
 783         trans->ops->set_pmi(trans, state);
 784 }
 785
 786 static inline void
 787 iwl_trans_set_bits_mask(struct iwl_trans *trans, u32 reg, u32 mask, u32 value)
 788 {
 789         trans->ops->set_bits_mask(trans, reg, mask, value);
 790 }
 791
 792 #define iwl_trans_grab_nic_access(trans, silent, flags) \
 793         __cond_lock(nic_access,                         \
 794                     likely((trans)->ops->grab_nic_access(trans, silent, flags)))
 795
 796 static inline void __releases(nic_access)
 797 iwl_trans_release_nic_access(struct iwl_trans *trans, unsigned long *flags)
 798 {
 799         trans->ops->release_nic_access(trans, flags);
 800         __release(nic_access);
 801 }
 802
 803 /*****************************************************
 804 * driver (transport) register/unregister functions
 805 ******************************************************/
 806 int __must_check iwl_pci_register_driver(void);
 807 void iwl_pci_unregister_driver(void);
 808
 809 static inline void trans_lockdep_init(struct iwl_trans *trans)
 810 {
 811 #ifdef CONFIG_LOCKDEP
 812         static struct lock_class_key __key;
 813
 814         lockdep_init_map(&trans->sync_cmd_lockdep_map, "sync_cmd_lockdep_map",
 815                          &__key, 0);
 816 #endif
 817 }
 818
 819 #endif /* __iwl_trans_h__ */