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

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  62  *****************************************************************************/
  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
  69 #include "iwl-debug.h"
  70 #include "iwl-config.h"
  71 #include "iwl-fw.h"
  72
  73 /**
  74  * DOC: Transport layer - what is it ?
  75  *
  76  * The tranport layer is the layer that deals with the HW directly. It provides
  77  * an abstraction of the underlying HW to the upper layer. The transport layer
  78  * doesn't provide any policy, algorithm or anything of this kind, but only
  79  * mechanisms to make the HW do something.It is not completely stateless but
  80  * close to it.
  81  * We will have an implementation for each different supported bus.
  82  */
  83
  84 /**
  85  * DOC: Life cycle of the transport layer
  86  *
  87  * The transport layer has a very precise life cycle.
  88  *
  89  *      1) A helper function is called during the module initialization and
  90  *         registers the bus driver's ops with the transport's alloc function.
  91  *      2) Bus's probe calls to the transport layer's allocation functions.
  92  *         Of course this function is bus specific.
  93  *      3) This allocation functions will spawn the upper layer which will
  94  *         register mac80211.
  95  *
  96  *      4) At some point (i.e. mac80211's start call), the op_mode will call
  97  *         the following sequence:
  98  *         start_hw
  99  *         start_fw
 100  *
 101  *      5) Then when finished (or reset):
 102  *         stop_fw (a.k.a. stop device for the moment)
 103  *         stop_hw
 104  *
 105  *      6) Eventually, the free function will be called.
 106  */
 107
 108 /**
 109  * DOC: Host command section
 110  *
 111  * A host command is a commaned issued by the upper layer to the fw. There are
 112  * several versions of fw that have several APIs. The transport layer is
 113  * completely agnostic to these differences.
 114  * The transport does provide helper functionnality (i.e. SYNC / ASYNC mode),
 115  */
 116 #define SEQ_TO_SN(seq) (((seq) & IEEE80211_SCTL_SEQ) >> 4)
 117 #define SN_TO_SEQ(ssn) (((ssn) << 4) & IEEE80211_SCTL_SEQ)
 118 #define MAX_SN ((IEEE80211_SCTL_SEQ) >> 4)
 119 #define SEQ_TO_QUEUE(s) (((s) >> 8) & 0x1f)
 120 #define QUEUE_TO_SEQ(q) (((q) & 0x1f) << 8)
 121 #define SEQ_TO_INDEX(s) ((s) & 0xff)
 122 #define INDEX_TO_SEQ(i) ((i) & 0xff)
 123 #define SEQ_RX_FRAME    cpu_to_le16(0x8000)
 124
 125 /**
 126  * struct iwl_cmd_header
 127  *
 128  * This header format appears in the beginning of each command sent from the
 129  * driver, and each response/notification received from uCode.
 130  */
 131 struct iwl_cmd_header {
 132         u8 cmd;         /* Command ID:  REPLY_RXON, etc. */
 133         u8 flags;       /* 0:5 reserved, 6 abort, 7 internal */
 134         /*
 135          * The driver sets up the sequence number to values of its choosing.
 136          * uCode does not use this value, but passes it back to the driver
 137          * when sending the response to each driver-originated command, so
 138          * the driver can match the response to the command.  Since the values
 139          * don't get used by uCode, the driver may set up an arbitrary format.
 140          *
 141          * There is one exception:  uCode sets bit 15 when it originates
 142          * the response/notification, i.e. when the response/notification
 143          * is not a direct response to a command sent by the driver.  For
 144          * example, uCode issues REPLY_RX when it sends a received frame
 145          * to the driver; it is not a direct response to any driver command.
 146          *
 147          * The Linux driver uses the following format:
 148          *
 149          *  0:7         tfd index - position within TX queue
 150          *  8:12        TX queue id
 151          *  13:14       reserved
 152          *  15          unsolicited RX or uCode-originated notification
 153          */
 154         __le16 sequence;
 155 } __packed;
 156
 157 /* iwl_cmd_header flags value */
 158 #define IWL_CMD_FAILED_MSK 0x40
 159
 160
 161 #define FH_RSCSR_FRAME_SIZE_MSK         0x00003FFF      /* bits 0-13 */
 162 #define FH_RSCSR_FRAME_INVALID          0x55550000
 163 #define FH_RSCSR_FRAME_ALIGN            0x40
 164
 165 struct iwl_rx_packet {
 166         /*
 167          * The first 4 bytes of the RX frame header contain both the RX frame
 168          * size and some flags.
 169          * Bit fields:
 170          * 31:    flag flush RB request
 171          * 30:    flag ignore TC (terminal counter) request
 172          * 29:    flag fast IRQ request
 173          * 28-14: Reserved
 174          * 13-00: RX frame size
 175          */
 176         __le32 len_n_flags;
 177         struct iwl_cmd_header hdr;
 178         u8 data[];
 179 } __packed;
 180
 181 /**
 182  * enum CMD_MODE - how to send the host commands ?
 183  *
 184  * @CMD_SYNC: The caller will be stalled until the fw responds to the command
 185  * @CMD_ASYNC: Return right away and don't want for the response
 186  * @CMD_WANT_SKB: valid only with CMD_SYNC. The caller needs the buffer of the
 187  *      response.
 188  * @CMD_ON_DEMAND: This command is sent by the test mode pipe.
 189  */
 190 enum CMD_MODE {
 191         CMD_SYNC = 0,
 192         CMD_ASYNC = BIT(0),
 193         CMD_WANT_SKB = BIT(1),
 194         CMD_ON_DEMAND = BIT(2),
 195 };
 196
 197 #define DEF_CMD_PAYLOAD_SIZE 320
 198
 199 /**
 200  * struct iwl_device_cmd
 201  *
 202  * For allocation of the command and tx queues, this establishes the overall
 203  * size of the largest command we send to uCode, except for commands that
 204  * aren't fully copied and use other TFD space.
 205  */
 206 struct iwl_device_cmd {
 207         struct iwl_cmd_header hdr;      /* uCode API */
 208         u8 payload[DEF_CMD_PAYLOAD_SIZE];
 209 } __packed;
 210
 211 #define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_device_cmd))
 212
 213 #define IWL_MAX_CMD_TFDS        2
 214
 215 /**
 216  * struct iwl_hcmd_dataflag - flag for each one of the chunks of the command
 217  *
 218  * IWL_HCMD_DFL_NOCOPY: By default, the command is copied to the host command's
 219  *      ring. The transport layer doesn't map the command's buffer to DMA, but
 220  *      rather copies it to an previously allocated DMA buffer. This flag tells
 221  *      the transport layer not to copy the command, but to map the existing
 222  *      buffer. This can save memcpy and is worth with very big comamnds.
 223  */
 224 enum iwl_hcmd_dataflag {
 225         IWL_HCMD_DFL_NOCOPY     = BIT(0),
 226 };
 227
 228 /**
 229  * struct iwl_host_cmd - Host command to the uCode
 230  *
 231  * @data: array of chunks that composes the data of the host command
 232  * @resp_pkt: response packet, if %CMD_WANT_SKB was set
 233  * @_rx_page_order: (internally used to free response packet)
 234  * @_rx_page_addr: (internally used to free response packet)
 235  * @handler_status: return value of the handler of the command
 236  *      (put in setup_rx_handlers) - valid for SYNC mode only
 237  * @flags: can be CMD_*
 238  * @len: array of the lenths of the chunks in data
 239  * @dataflags: IWL_HCMD_DFL_*
 240  * @id: id of the host command
 241  */
 242 struct iwl_host_cmd {
 243         const void *data[IWL_MAX_CMD_TFDS];
 244         struct iwl_rx_packet *resp_pkt;
 245         unsigned long _rx_page_addr;
 246         u32 _rx_page_order;
 247         int handler_status;
 248
 249         u32 flags;
 250         u16 len[IWL_MAX_CMD_TFDS];
 251         u8 dataflags[IWL_MAX_CMD_TFDS];
 252         u8 id;
 253 };
 254
 255 static inline void iwl_free_resp(struct iwl_host_cmd *cmd)
 256 {
 257         free_pages(cmd->_rx_page_addr, cmd->_rx_page_order);
 258 }
 259
 260 struct iwl_rx_cmd_buffer {
 261         struct page *_page;
 262         int _offset;
 263         bool _page_stolen;
 264         unsigned int truesize;
 265 };
 266
 267 static inline void *rxb_addr(struct iwl_rx_cmd_buffer *r)
 268 {
 269         return (void *)((unsigned long)page_address(r->_page) + r->_offset);
 270 }
 271
 272 static inline int rxb_offset(struct iwl_rx_cmd_buffer *r)
 273 {
 274         return r->_offset;
 275 }
 276
 277 static inline struct page *rxb_steal_page(struct iwl_rx_cmd_buffer *r)
 278 {
 279         r->_page_stolen = true;
 280         get_page(r->_page);
 281         return r->_page;
 282 }
 283
 284 #define MAX_NO_RECLAIM_CMDS     6
 285
 286 #define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))
 287
 288 /*
 289  * Maximum number of HW queues the transport layer
 290  * currently supports
 291  */
 292 #define IWL_MAX_HW_QUEUES               32
 293
 294 /**
 295  * struct iwl_trans_config - transport configuration
 296  *
 297  * @op_mode: pointer to the upper layer.
 298  * @queue_to_fifo: queue to FIFO mapping to set up by
 299  *      default
 300  * @n_queue_to_fifo: number of queues to set up
 301  * @cmd_queue: the index of the command queue.
 302  *      Must be set before start_fw.
 303  * @no_reclaim_cmds: Some devices erroneously don't set the
 304  *      SEQ_RX_FRAME bit on some notifications, this is the
 305  *      list of such notifications to filter. Max length is
 306  *      %MAX_NO_RECLAIM_CMDS.
 307  * @n_no_reclaim_cmds: # of commands in list
 308  * @rx_buf_size_8k: 8 kB RX buffer size needed for A-MSDUs,
 309  *      if unset 4k will be the RX buffer size
 310  * @queue_watchdog_timeout: time (in ms) after which queues
 311  *      are considered stuck and will trigger device restart
 312  * @command_names: array of command names, must be 256 entries
 313  *      (one for each command); for debugging only
 314  */
 315 struct iwl_trans_config {
 316         struct iwl_op_mode *op_mode;
 317         const u8 *queue_to_fifo;
 318         u8 n_queue_to_fifo;
 319
 320         u8 cmd_queue;
 321         const u8 *no_reclaim_cmds;
 322         int n_no_reclaim_cmds;
 323
 324         bool rx_buf_size_8k;
 325         unsigned int queue_watchdog_timeout;
 326         const char **command_names;
 327 };
 328
 329 struct iwl_trans;
 330
 331 /**
 332  * struct iwl_trans_ops - transport specific operations
 333  *
 334  * All the handlers MUST be implemented
 335  *
 336  * @start_hw: starts the HW- from that point on, the HW can send interrupts
 337  *      May sleep
 338  * @stop_hw: stops the HW- from that point on, the HW will be in low power but
 339  *      will still issue interrupt if the HW RF kill is triggered unless
 340  *      op_mode_leaving is true.
 341  *      May sleep
 342  * @start_fw: allocates and inits all the resources for the transport
 343  *      layer. Also kick a fw image.
 344  *      May sleep
 345  * @fw_alive: called when the fw sends alive notification
 346  *      May sleep
 347  * @stop_device:stops the whole device (embedded CPU put to reset)
 348  *      May sleep
 349  * @wowlan_suspend: put the device into the correct mode for WoWLAN during
 350  *      suspend. This is optional, if not implemented WoWLAN will not be
 351  *      supported. This callback may sleep.
 352  * @send_cmd:send a host command
 353  *      May sleep only if CMD_SYNC is set
 354  * @tx: send an skb
 355  *      Must be atomic
 356  * @reclaim: free packet until ssn. Returns a list of freed packets.
 357  *      Must be atomic
 358  * @txq_enable: setup a tx queue for AMPDU - will be called once the HW is
 359  *      ready and a successful ADDBA response has been received.
 360  *      May sleep
 361  * @txq_disable: de-configure a Tx queue to send AMPDUs
 362  *      Must be atomic
 363  * @wait_tx_queue_empty: wait until all tx queues are empty
 364  *      May sleep
 365  * @dbgfs_register: add the dbgfs files under this directory. Files will be
 366  *      automatically deleted.
 367  * @suspend: stop the device unless WoWLAN is configured
 368  * @resume: resume activity of the device
 369  * @write8: write a u8 to a register at offset ofs from the BAR
 370  * @write32: write a u32 to a register at offset ofs from the BAR
 371  * @read32: read a u32 register at offset ofs from the BAR
 372  * @configure: configure parameters required by the transport layer from
 373  *      the op_mode. May be called several times before start_fw, can't be
 374  *      called after that.
 375  * @set_pmi: set the power pmi state
 376  */
 377 struct iwl_trans_ops {
 378
 379         int (*start_hw)(struct iwl_trans *iwl_trans);
 380         void (*stop_hw)(struct iwl_trans *iwl_trans, bool op_mode_leaving);
 381         int (*start_fw)(struct iwl_trans *trans, const struct fw_img *fw);
 382         void (*fw_alive)(struct iwl_trans *trans);
 383         void (*stop_device)(struct iwl_trans *trans);
 384
 385         void (*wowlan_suspend)(struct iwl_trans *trans);
 386
 387         int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
 388
 389         int (*tx)(struct iwl_trans *trans, struct sk_buff *skb,
 390                   struct iwl_device_cmd *dev_cmd, int queue);
 391         void (*reclaim)(struct iwl_trans *trans, int queue, int ssn,
 392                         struct sk_buff_head *skbs);
 393
 394         void (*txq_enable)(struct iwl_trans *trans, int queue, int fifo,
 395                            int sta_id, int tid, int frame_limit, u16 ssn);
 396         void (*txq_disable)(struct iwl_trans *trans, int queue);
 397
 398         int (*dbgfs_register)(struct iwl_trans *trans, struct dentry* dir);
 399         int (*wait_tx_queue_empty)(struct iwl_trans *trans);
 400 #ifdef CONFIG_PM_SLEEP
 401         int (*suspend)(struct iwl_trans *trans);
 402         int (*resume)(struct iwl_trans *trans);
 403 #endif
 404         void (*write8)(struct iwl_trans *trans, u32 ofs, u8 val);
 405         void (*write32)(struct iwl_trans *trans, u32 ofs, u32 val);
 406         u32 (*read32)(struct iwl_trans *trans, u32 ofs);
 407         void (*configure)(struct iwl_trans *trans,
 408                           const struct iwl_trans_config *trans_cfg);
 409         void (*set_pmi)(struct iwl_trans *trans, bool state);
 410 };
 411
 412 /**
 413  * enum iwl_trans_state - state of the transport layer
 414  *
 415  * @IWL_TRANS_NO_FW: no fw has sent an alive response
 416  * @IWL_TRANS_FW_ALIVE: a fw has sent an alive response
 417  */
 418 enum iwl_trans_state {
 419         IWL_TRANS_NO_FW = 0,
 420         IWL_TRANS_FW_ALIVE      = 1,
 421 };
 422
 423 /**
 424  * struct iwl_trans - transport common data
 425  *
 426  * @ops - pointer to iwl_trans_ops
 427  * @op_mode - pointer to the op_mode
 428  * @cfg - pointer to the configuration
 429  * @reg_lock - protect hw register access
 430  * @dev - pointer to struct device * that represents the device
 431  * @hw_id: a u32 with the ID of the device / subdevice.
 432  *      Set during transport allocation.
 433  * @hw_id_str: a string with info about HW ID. Set during transport allocation.
 434  * @pm_support: set to true in start_hw if link pm is supported
 435  * @wait_command_queue: the wait_queue for SYNC host commands
 436  * @dev_cmd_pool: pool for Tx cmd allocation - for internal use only.
 437  *      The user should use iwl_trans_{alloc,free}_tx_cmd.
 438  * @dev_cmd_headroom: room needed for the transport's private use before the
 439  *      device_cmd for Tx - for internal use only
 440  *      The user should use iwl_trans_{alloc,free}_tx_cmd.
 441  */
 442 struct iwl_trans {
 443         const struct iwl_trans_ops *ops;
 444         struct iwl_op_mode *op_mode;
 445         const struct iwl_cfg *cfg;
 446         enum iwl_trans_state state;
 447         spinlock_t reg_lock;
 448
 449         struct device *dev;
 450         u32 hw_rev;
 451         u32 hw_id;
 452         char hw_id_str[52];
 453
 454         bool pm_support;
 455
 456         wait_queue_head_t wait_command_queue;
 457
 458         /* The following fields are internal only */
 459         struct kmem_cache *dev_cmd_pool;
 460         size_t dev_cmd_headroom;
 461
 462         /* pointer to trans specific struct */
 463         /*Ensure that this pointer will always be aligned to sizeof pointer */
 464         char trans_specific[0] __aligned(sizeof(void *));
 465 };
 466
 467 static inline void iwl_trans_configure(struct iwl_trans *trans,
 468                                        const struct iwl_trans_config *trans_cfg)
 469 {
 470         /*
 471          * only set the op_mode for the moment. Later on, this function will do
 472          * more
 473          */
 474         trans->op_mode = trans_cfg->op_mode;
 475
 476         trans->ops->configure(trans, trans_cfg);
 477 }
 478
 479 static inline int iwl_trans_start_hw(struct iwl_trans *trans)
 480 {
 481         might_sleep();
 482
 483         return trans->ops->start_hw(trans);
 484 }
 485
 486 static inline void iwl_trans_stop_hw(struct iwl_trans *trans,
 487                                      bool op_mode_leaving)
 488 {
 489         might_sleep();
 490
 491         trans->ops->stop_hw(trans, op_mode_leaving);
 492
 493         trans->state = IWL_TRANS_NO_FW;
 494 }
 495
 496 static inline void iwl_trans_fw_alive(struct iwl_trans *trans)
 497 {
 498         might_sleep();
 499
 500         trans->ops->fw_alive(trans);
 501
 502         trans->state = IWL_TRANS_FW_ALIVE;
 503 }
 504
 505 static inline int iwl_trans_start_fw(struct iwl_trans *trans,
 506                                      const struct fw_img *fw)
 507 {
 508         might_sleep();
 509
 510         return trans->ops->start_fw(trans, fw);
 511 }
 512
 513 static inline void iwl_trans_stop_device(struct iwl_trans *trans)
 514 {
 515         might_sleep();
 516
 517         trans->ops->stop_device(trans);
 518
 519         trans->state = IWL_TRANS_NO_FW;
 520 }
 521
 522 static inline void iwl_trans_wowlan_suspend(struct iwl_trans *trans)
 523 {
 524         might_sleep();
 525         trans->ops->wowlan_suspend(trans);
 526 }
 527
 528 static inline int iwl_trans_send_cmd(struct iwl_trans *trans,
 529                                 struct iwl_host_cmd *cmd)
 530 {
 531         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 532                   "%s bad state = %d", __func__, trans->state);
 533
 534         return trans->ops->send_cmd(trans, cmd);
 535 }
 536
 537 static inline struct iwl_device_cmd *
 538 iwl_trans_alloc_tx_cmd(struct iwl_trans *trans)
 539 {
 540         u8 *dev_cmd_ptr = kmem_cache_alloc(trans->dev_cmd_pool, GFP_ATOMIC);
 541
 542         if (unlikely(dev_cmd_ptr == NULL))
 543                 return NULL;
 544
 545         return (struct iwl_device_cmd *)
 546                         (dev_cmd_ptr + trans->dev_cmd_headroom);
 547 }
 548
 549 static inline void iwl_trans_free_tx_cmd(struct iwl_trans *trans,
 550                                          struct iwl_device_cmd *dev_cmd)
 551 {
 552         u8 *dev_cmd_ptr = (u8 *)dev_cmd - trans->dev_cmd_headroom;
 553
 554         kmem_cache_free(trans->dev_cmd_pool, dev_cmd_ptr);
 555 }
 556
 557 static inline int iwl_trans_tx(struct iwl_trans *trans, struct sk_buff *skb,
 558                                struct iwl_device_cmd *dev_cmd, int queue)
 559 {
 560         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 561                   "%s bad state = %d", __func__, trans->state);
 562
 563         return trans->ops->tx(trans, skb, dev_cmd, queue);
 564 }
 565
 566 static inline void iwl_trans_reclaim(struct iwl_trans *trans, int queue,
 567                                      int ssn, struct sk_buff_head *skbs)
 568 {
 569         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 570                   "%s bad state = %d", __func__, trans->state);
 571
 572         trans->ops->reclaim(trans, queue, ssn, skbs);
 573 }
 574
 575 static inline void iwl_trans_txq_disable(struct iwl_trans *trans, int queue)
 576 {
 577         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 578                   "%s bad state = %d", __func__, trans->state);
 579
 580         trans->ops->txq_disable(trans, queue);
 581 }
 582
 583 static inline void iwl_trans_txq_enable(struct iwl_trans *trans, int queue,
 584                                         int fifo, int sta_id, int tid,
 585                                         int frame_limit, u16 ssn)
 586 {
 587         might_sleep();
 588
 589         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 590                   "%s bad state = %d", __func__, trans->state);
 591
 592         trans->ops->txq_enable(trans, queue, fifo, sta_id, tid,
 593                                  frame_limit, ssn);
 594 }
 595
 596 static inline int iwl_trans_wait_tx_queue_empty(struct iwl_trans *trans)
 597 {
 598         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 599                   "%s bad state = %d", __func__, trans->state);
 600
 601         return trans->ops->wait_tx_queue_empty(trans);
 602 }
 603
 604 static inline int iwl_trans_dbgfs_register(struct iwl_trans *trans,
 605                                             struct dentry *dir)
 606 {
 607         return trans->ops->dbgfs_register(trans, dir);
 608 }
 609
 610 #ifdef CONFIG_PM_SLEEP
 611 static inline int iwl_trans_suspend(struct iwl_trans *trans)
 612 {
 613         return trans->ops->suspend(trans);
 614 }
 615
 616 static inline int iwl_trans_resume(struct iwl_trans *trans)
 617 {
 618         return trans->ops->resume(trans);
 619 }
 620 #endif
 621
 622 static inline void iwl_trans_write8(struct iwl_trans *trans, u32 ofs, u8 val)
 623 {
 624         trans->ops->write8(trans, ofs, val);
 625 }
 626
 627 static inline void iwl_trans_write32(struct iwl_trans *trans, u32 ofs, u32 val)
 628 {
 629         trans->ops->write32(trans, ofs, val);
 630 }
 631
 632 static inline u32 iwl_trans_read32(struct iwl_trans *trans, u32 ofs)
 633 {
 634         return trans->ops->read32(trans, ofs);
 635 }
 636
 637 static inline void iwl_trans_set_pmi(struct iwl_trans *trans, bool state)
 638 {
 639         trans->ops->set_pmi(trans, state);
 640 }
 641
 642 /*****************************************************
 643 * driver (transport) register/unregister functions
 644 ******************************************************/
 645 int __must_check iwl_pci_register_driver(void);
 646 void iwl_pci_unregister_driver(void);
 647
 648 #endif /* __iwl_trans_h__ */