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

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   8  * Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved.
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  62  *****************************************************************************/
  63 #ifndef __iwl_trans_h__
  64 #define __iwl_trans_h__
  65
  66 #include <linux/ieee80211.h>
  67
  68 #include "iwl-shared.h"
  69 #include "iwl-debug.h"
  70
  71 /**
  72  * DOC: Transport layer - what is it ?
  73  *
  74  * The tranport layer is the layer that deals with the HW directly. It provides
  75  * an abstraction of the underlying HW to the upper layer. The transport layer
  76  * doesn't provide any policy, algorithm or anything of this kind, but only
  77  * mechanisms to make the HW do something.It is not completely stateless but
  78  * close to it.
  79  * We will have an implementation for each different supported bus.
  80  */
  81
  82 /**
  83  * DOC: Life cycle of the transport layer
  84  *
  85  * The transport layer has a very precise life cycle.
  86  *
  87  *      1) A helper function is called during the module initialization and
  88  *         registers the bus driver's ops with the transport's alloc function.
  89  *      2) Bus's probe calls to the transport layer's allocation functions.
  90  *         Of course this function is bus specific.
  91  *      3) This allocation functions will spawn the upper layer which will
  92  *         register mac80211.
  93  *
  94  *      4) At some point (i.e. mac80211's start call), the op_mode will call
  95  *         the following sequence:
  96  *         start_hw
  97  *         start_fw
  98  *
  99  *      5) Then when finished (or reset):
 100  *         stop_fw (a.k.a. stop device for the moment)
 101  *         stop_hw
 102  *
 103  *      6) Eventually, the free function will be called.
 104  */
 105
 106 struct iwl_priv;
 107 struct iwl_shared;
 108 struct iwl_op_mode;
 109 struct fw_img;
 110 struct sk_buff;
 111 struct dentry;
 112
 113 /**
 114  * DOC: Host command section
 115  *
 116  * A host command is a commaned issued by the upper layer to the fw. There are
 117  * several versions of fw that have several APIs. The transport layer is
 118  * completely agnostic to these differences.
 119  * The transport does provide helper functionnality (i.e. SYNC / ASYNC mode),
 120  */
 121 #define SEQ_TO_SN(seq) (((seq) & IEEE80211_SCTL_SEQ) >> 4)
 122 #define SN_TO_SEQ(ssn) (((ssn) << 4) & IEEE80211_SCTL_SEQ)
 123 #define MAX_SN ((IEEE80211_SCTL_SEQ) >> 4)
 124
 125 /**
 126  * enum CMD_MODE - how to send the host commands ?
 127  *
 128  * @CMD_SYNC: The caller will be stalled until the fw responds to the command
 129  * @CMD_ASYNC: Return right away and don't want for the response
 130  * @CMD_WANT_SKB: valid only with CMD_SYNC. The caller needs the buffer of the
 131  *      response.
 132  * @CMD_ON_DEMAND: This command is sent by the test mode pipe.
 133  */
 134 enum CMD_MODE {
 135         CMD_SYNC = 0,
 136         CMD_ASYNC = BIT(0),
 137         CMD_WANT_SKB = BIT(1),
 138         CMD_ON_DEMAND = BIT(2),
 139 };
 140
 141 #define DEF_CMD_PAYLOAD_SIZE 320
 142
 143 /**
 144  * struct iwl_device_cmd
 145  *
 146  * For allocation of the command and tx queues, this establishes the overall
 147  * size of the largest command we send to uCode, except for commands that
 148  * aren't fully copied and use other TFD space.
 149  */
 150 struct iwl_device_cmd {
 151         struct iwl_cmd_header hdr;      /* uCode API */
 152         u8 payload[DEF_CMD_PAYLOAD_SIZE];
 153 } __packed;
 154
 155 #define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_device_cmd))
 156
 157 #define IWL_MAX_CMD_TFDS        2
 158
 159 /**
 160  * struct iwl_hcmd_dataflag - flag for each one of the chunks of the command
 161  *
 162  * IWL_HCMD_DFL_NOCOPY: By default, the command is copied to the host command's
 163  *      ring. The transport layer doesn't map the command's buffer to DMA, but
 164  *      rather copies it to an previously allocated DMA buffer. This flag tells
 165  *      the transport layer not to copy the command, but to map the existing
 166  *      buffer. This can save memcpy and is worth with very big comamnds.
 167  */
 168 enum iwl_hcmd_dataflag {
 169         IWL_HCMD_DFL_NOCOPY     = BIT(0),
 170 };
 171
 172 /**
 173  * struct iwl_host_cmd - Host command to the uCode
 174  *
 175  * @data: array of chunks that composes the data of the host command
 176  * @reply_page: pointer to the page that holds the response to the host command
 177  * @handler_status: return value of the handler of the command
 178  *      (put in setup_rx_handlers) - valid for SYNC mode only
 179  * @flags: can be CMD_*
 180  * @len: array of the lenths of the chunks in data
 181  * @dataflags: IWL_HCMD_DFL_*
 182  * @id: id of the host command
 183  */
 184 struct iwl_host_cmd {
 185         const void *data[IWL_MAX_CMD_TFDS];
 186         unsigned long reply_page;
 187         int handler_status;
 188
 189         u32 flags;
 190         u16 len[IWL_MAX_CMD_TFDS];
 191         u8 dataflags[IWL_MAX_CMD_TFDS];
 192         u8 id;
 193 };
 194
 195 /**
 196  * struct iwl_trans_ops - transport specific operations
 197  *
 198  * All the handlers MUST be implemented
 199  *
 200  * @start_hw: starts the HW- from that point on, the HW can send interrupts
 201  *      May sleep
 202  * @stop_hw: stops the HW- from that point on, the HW will be in low power but
 203  *      will still issue interrupt if the HW RF kill is triggered.
 204  *      May sleep
 205  * @start_fw: allocates and inits all the resources for the transport
 206  *      layer. Also kick a fw image.
 207  *      May sleep
 208  * @fw_alive: called when the fw sends alive notification
 209  *      May sleep
 210  * @wake_any_queue: wake all the queues of a specfic context IWL_RXON_CTX_*
 211  * @stop_device:stops the whole device (embedded CPU put to reset)
 212  *      May sleep
 213  * @wowlan_suspend: put the device into the correct mode for WoWLAN during
 214  *      suspend. This is optional, if not implemented WoWLAN will not be
 215  *      supported. This callback may sleep.
 216  * @send_cmd:send a host command
 217  *      May sleep only if CMD_SYNC is set
 218  * @tx: send an skb
 219  *      Must be atomic
 220  * @reclaim: free packet until ssn. Returns a list of freed packets.
 221  *      Must be atomic
 222  * @tx_agg_alloc: allocate resources for a TX BA session
 223  *      May sleep
 224  * @tx_agg_setup: setup a tx queue for AMPDU - will be called once the HW is
 225  *      ready and a successful ADDBA response has been received.
 226  *      May sleep
 227  * @tx_agg_disable: de-configure a Tx queue to send AMPDUs
 228  *      May sleep
 229  * @free: release all the ressource for the transport layer itself such as
 230  *      irq, tasklet etc... From this point on, the device may not issue
 231  *      any interrupt (incl. RFKILL).
 232  *      May sleep
 233  * @stop_queue: stop a specific queue
 234  * @check_stuck_queue: check if a specific queue is stuck
 235  * @wait_tx_queue_empty: wait until all tx queues are empty
 236  *      May sleep
 237  * @dbgfs_register: add the dbgfs files under this directory. Files will be
 238  *      automatically deleted.
 239  * @suspend: stop the device unless WoWLAN is configured
 240  * @resume: resume activity of the device
 241  * @write8: write a u8 to a register at offset ofs from the BAR
 242  * @write32: write a u32 to a register at offset ofs from the BAR
 243  * @read32: read a u32 register at offset ofs from the BAR
 244  */
 245 struct iwl_trans_ops {
 246
 247         int (*start_hw)(struct iwl_trans *iwl_trans);
 248         void (*stop_hw)(struct iwl_trans *iwl_trans);
 249         int (*start_fw)(struct iwl_trans *trans, struct fw_img *fw);
 250         void (*fw_alive)(struct iwl_trans *trans);
 251         void (*stop_device)(struct iwl_trans *trans);
 252
 253         void (*wowlan_suspend)(struct iwl_trans *trans);
 254
 255         void (*wake_any_queue)(struct iwl_trans *trans,
 256                                enum iwl_rxon_context_id ctx,
 257                                const char *msg);
 258
 259         int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
 260
 261         int (*tx)(struct iwl_trans *trans, struct sk_buff *skb,
 262                 struct iwl_device_cmd *dev_cmd, enum iwl_rxon_context_id ctx,
 263                 u8 sta_id, u8 tid);
 264         int (*reclaim)(struct iwl_trans *trans, int sta_id, int tid,
 265                         int txq_id, int ssn, u32 status,
 266                         struct sk_buff_head *skbs);
 267
 268         int (*tx_agg_disable)(struct iwl_trans *trans,
 269                               int sta_id, int tid);
 270         int (*tx_agg_alloc)(struct iwl_trans *trans,
 271                             int sta_id, int tid);
 272         void (*tx_agg_setup)(struct iwl_trans *trans,
 273                              enum iwl_rxon_context_id ctx, int sta_id, int tid,
 274                              int frame_limit, u16 ssn);
 275
 276         void (*free)(struct iwl_trans *trans);
 277
 278         void (*stop_queue)(struct iwl_trans *trans, int q, const char *msg);
 279
 280         int (*dbgfs_register)(struct iwl_trans *trans, struct dentry* dir);
 281         int (*check_stuck_queue)(struct iwl_trans *trans, int q);
 282         int (*wait_tx_queue_empty)(struct iwl_trans *trans);
 283 #ifdef CONFIG_PM_SLEEP
 284         int (*suspend)(struct iwl_trans *trans);
 285         int (*resume)(struct iwl_trans *trans);
 286 #endif
 287         void (*write8)(struct iwl_trans *trans, u32 ofs, u8 val);
 288         void (*write32)(struct iwl_trans *trans, u32 ofs, u32 val);
 289         u32 (*read32)(struct iwl_trans *trans, u32 ofs);
 290 };
 291
 292 /* Opaque calibration results */
 293 struct iwl_calib_result {
 294         struct list_head list;
 295         size_t cmd_len;
 296         struct iwl_calib_hdr hdr;
 297         /* data follows */
 298 };
 299
 300 /**
 301  * enum iwl_trans_state - state of the transport layer
 302  *
 303  * @IWL_TRANS_NO_FW: no fw has sent an alive response
 304  * @IWL_TRANS_FW_ALIVE: a fw has sent an alive response
 305  */
 306 enum iwl_trans_state {
 307         IWL_TRANS_NO_FW = 0,
 308         IWL_TRANS_FW_ALIVE      = 1,
 309 };
 310
 311 /**
 312  * struct iwl_trans - transport common data
 313  *
 314  * @ops - pointer to iwl_trans_ops
 315  * @op_mode - pointer to the op_mode
 316  * @shrd - pointer to iwl_shared which holds shared data from the upper layer
 317  * @reg_lock - protect hw register access
 318  * @dev - pointer to struct device * that represents the device
 319  * @irq - the irq number for the device
 320  * @hw_id: a u32 with the ID of the device / subdevice.
 321  *      Set during transport allocation.
 322  * @hw_id_str: a string with info about HW ID. Set during transport allocation.
 323  * @ucode_write_complete: indicates that the ucode has been copied.
 324  * @nvm_device_type: indicates OTP or eeprom
 325  * @pm_support: set to true in start_hw if link pm is supported
 326  * @calib_results: list head for init calibration results
 327  */
 328 struct iwl_trans {
 329         const struct iwl_trans_ops *ops;
 330         struct iwl_op_mode *op_mode;
 331         struct iwl_shared *shrd;
 332         enum iwl_trans_state state;
 333         spinlock_t reg_lock;
 334
 335         struct device *dev;
 336         unsigned int irq;
 337         u32 hw_rev;
 338         u32 hw_id;
 339         char hw_id_str[52];
 340
 341         u8 ucode_write_complete;
 342
 343         int    nvm_device_type;
 344         bool pm_support;
 345
 346         struct list_head calib_results;
 347
 348         /* pointer to trans specific struct */
 349         /*Ensure that this pointer will always be aligned to sizeof pointer */
 350         char trans_specific[0] __aligned(sizeof(void *));
 351 };
 352
 353 static inline void iwl_trans_configure(struct iwl_trans *trans,
 354                                        struct iwl_op_mode *op_mode)
 355 {
 356         /*
 357          * only set the op_mode for the moment. Later on, this function will do
 358          * more
 359          */
 360         trans->op_mode = op_mode;
 361 }
 362
 363 static inline int iwl_trans_start_hw(struct iwl_trans *trans)
 364 {
 365         might_sleep();
 366
 367         return trans->ops->start_hw(trans);
 368 }
 369
 370 static inline void iwl_trans_stop_hw(struct iwl_trans *trans)
 371 {
 372         might_sleep();
 373
 374         trans->ops->stop_hw(trans);
 375
 376         trans->state = IWL_TRANS_NO_FW;
 377 }
 378
 379 static inline void iwl_trans_fw_alive(struct iwl_trans *trans)
 380 {
 381         might_sleep();
 382
 383         trans->ops->fw_alive(trans);
 384
 385         trans->state = IWL_TRANS_FW_ALIVE;
 386 }
 387
 388 static inline int iwl_trans_start_fw(struct iwl_trans *trans, struct fw_img *fw)
 389 {
 390         might_sleep();
 391
 392         return trans->ops->start_fw(trans, fw);
 393 }
 394
 395 static inline void iwl_trans_stop_device(struct iwl_trans *trans)
 396 {
 397         might_sleep();
 398
 399         trans->ops->stop_device(trans);
 400
 401         trans->state = IWL_TRANS_NO_FW;
 402 }
 403
 404 static inline void iwl_trans_wowlan_suspend(struct iwl_trans *trans)
 405 {
 406         might_sleep();
 407         trans->ops->wowlan_suspend(trans);
 408 }
 409
 410 static inline void iwl_trans_wake_any_queue(struct iwl_trans *trans,
 411                                             enum iwl_rxon_context_id ctx,
 412                                             const char *msg)
 413 {
 414         if (trans->state != IWL_TRANS_FW_ALIVE)
 415                 IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
 416
 417         trans->ops->wake_any_queue(trans, ctx, msg);
 418 }
 419
 420
 421 static inline int iwl_trans_send_cmd(struct iwl_trans *trans,
 422                                 struct iwl_host_cmd *cmd)
 423 {
 424         if (trans->state != IWL_TRANS_FW_ALIVE)
 425                 IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
 426
 427         return trans->ops->send_cmd(trans, cmd);
 428 }
 429
 430 int iwl_trans_send_cmd_pdu(struct iwl_trans *trans, u8 id,
 431                            u32 flags, u16 len, const void *data);
 432
 433 static inline int iwl_trans_tx(struct iwl_trans *trans, struct sk_buff *skb,
 434                 struct iwl_device_cmd *dev_cmd, enum iwl_rxon_context_id ctx,
 435                 u8 sta_id, u8 tid)
 436 {
 437         if (trans->state != IWL_TRANS_FW_ALIVE)
 438                 IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
 439
 440         return trans->ops->tx(trans, skb, dev_cmd, ctx, sta_id, tid);
 441 }
 442
 443 static inline int iwl_trans_reclaim(struct iwl_trans *trans, int sta_id,
 444                                  int tid, int txq_id, int ssn, u32 status,
 445                                  struct sk_buff_head *skbs)
 446 {
 447         if (trans->state != IWL_TRANS_FW_ALIVE)
 448                 IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
 449
 450         return trans->ops->reclaim(trans, sta_id, tid, txq_id, ssn,
 451                                    status, skbs);
 452 }
 453
 454 static inline int iwl_trans_tx_agg_disable(struct iwl_trans *trans,
 455                                             int sta_id, int tid)
 456 {
 457         might_sleep();
 458
 459         if (trans->state != IWL_TRANS_FW_ALIVE)
 460                 IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
 461
 462         return trans->ops->tx_agg_disable(trans, sta_id, tid);
 463 }
 464
 465 static inline int iwl_trans_tx_agg_alloc(struct iwl_trans *trans,
 466                                          int sta_id, int tid)
 467 {
 468         might_sleep();
 469
 470         if (trans->state != IWL_TRANS_FW_ALIVE)
 471                 IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
 472
 473         return trans->ops->tx_agg_alloc(trans, sta_id, tid);
 474 }
 475
 476
 477 static inline void iwl_trans_tx_agg_setup(struct iwl_trans *trans,
 478                                            enum iwl_rxon_context_id ctx,
 479                                            int sta_id, int tid,
 480                                            int frame_limit, u16 ssn)
 481 {
 482         might_sleep();
 483
 484         if (trans->state != IWL_TRANS_FW_ALIVE)
 485                 IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
 486
 487         trans->ops->tx_agg_setup(trans, ctx, sta_id, tid, frame_limit, ssn);
 488 }
 489
 490 static inline void iwl_trans_free(struct iwl_trans *trans)
 491 {
 492         trans->ops->free(trans);
 493 }
 494
 495 static inline void iwl_trans_stop_queue(struct iwl_trans *trans, int q,
 496                                         const char *msg)
 497 {
 498         if (trans->state != IWL_TRANS_FW_ALIVE)
 499                 IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
 500
 501         trans->ops->stop_queue(trans, q, msg);
 502 }
 503
 504 static inline int iwl_trans_wait_tx_queue_empty(struct iwl_trans *trans)
 505 {
 506         if (trans->state != IWL_TRANS_FW_ALIVE)
 507                 IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
 508
 509         return trans->ops->wait_tx_queue_empty(trans);
 510 }
 511
 512 static inline int iwl_trans_check_stuck_queue(struct iwl_trans *trans, int q)
 513 {
 514         if (trans->state != IWL_TRANS_FW_ALIVE)
 515                 IWL_ERR(trans, "%s bad state = %d", __func__, trans->state);
 516
 517         return trans->ops->check_stuck_queue(trans, q);
 518 }
 519 static inline int iwl_trans_dbgfs_register(struct iwl_trans *trans,
 520                                             struct dentry *dir)
 521 {
 522         return trans->ops->dbgfs_register(trans, dir);
 523 }
 524
 525 #ifdef CONFIG_PM_SLEEP
 526 static inline int iwl_trans_suspend(struct iwl_trans *trans)
 527 {
 528         return trans->ops->suspend(trans);
 529 }
 530
 531 static inline int iwl_trans_resume(struct iwl_trans *trans)
 532 {
 533         return trans->ops->resume(trans);
 534 }
 535 #endif
 536
 537 static inline void iwl_trans_write8(struct iwl_trans *trans, u32 ofs, u8 val)
 538 {
 539         trans->ops->write8(trans, ofs, val);
 540 }
 541
 542 static inline void iwl_trans_write32(struct iwl_trans *trans, u32 ofs, u32 val)
 543 {
 544         trans->ops->write32(trans, ofs, val);
 545 }
 546
 547 static inline u32 iwl_trans_read32(struct iwl_trans *trans, u32 ofs)
 548 {
 549         return trans->ops->read32(trans, ofs);
 550 }
 551
 552 /*****************************************************
 553 * Utils functions
 554 ******************************************************/
 555 int iwl_send_calib_results(struct iwl_trans *trans);
 556 int iwl_calib_set(struct iwl_trans *trans,
 557                   const struct iwl_calib_hdr *cmd, int len);
 558 void iwl_calib_free_results(struct iwl_trans *trans);
 559
 560 /*****************************************************
 561 * Transport layers implementations + their allocation function
 562 ******************************************************/
 563 struct pci_dev;
 564 struct pci_device_id;
 565 extern const struct iwl_trans_ops trans_ops_pcie;
 566 struct iwl_trans *iwl_trans_pcie_alloc(struct iwl_shared *shrd,
 567                                        struct pci_dev *pdev,
 568                                        const struct pci_device_id *ent);
 569 int __must_check iwl_pci_register_driver(void);
 570 void iwl_pci_unregister_driver(void);
 571
 572 extern const struct iwl_trans_ops trans_ops_idi;
 573 struct iwl_trans *iwl_trans_idi_alloc(struct iwl_shared *shrd,
 574                                       void *pdev_void,
 575                                       const void *ent_void);
 576 #endif /* __iwl_trans_h__ */