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
  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
 158 #define FH_RSCSR_FRAME_SIZE_MSK         0x00003FFF      /* bits 0-13 */
 159 #define FH_RSCSR_FRAME_INVALID          0x55550000
 160 #define FH_RSCSR_FRAME_ALIGN            0x40
 161
 162 struct iwl_rx_packet {
 163         /*
 164          * The first 4 bytes of the RX frame header contain both the RX frame
 165          * size and some flags.
 166          * Bit fields:
 167          * 31:    flag flush RB request
 168          * 30:    flag ignore TC (terminal counter) request
 169          * 29:    flag fast IRQ request
 170          * 28-14: Reserved
 171          * 13-00: RX frame size
 172          */
 173         __le32 len_n_flags;
 174         struct iwl_cmd_header hdr;
 175         u8 data[];
 176 } __packed;
 177
 178 /**
 179  * enum CMD_MODE - how to send the host commands ?
 180  *
 181  * @CMD_SYNC: The caller will be stalled until the fw responds to the command
 182  * @CMD_ASYNC: Return right away and don't want for the response
 183  * @CMD_WANT_SKB: valid only with CMD_SYNC. The caller needs the buffer of the
 184  *      response.
 185  * @CMD_ON_DEMAND: This command is sent by the test mode pipe.
 186  */
 187 enum CMD_MODE {
 188         CMD_SYNC = 0,
 189         CMD_ASYNC = BIT(0),
 190         CMD_WANT_SKB = BIT(1),
 191         CMD_ON_DEMAND = BIT(2),
 192 };
 193
 194 #define DEF_CMD_PAYLOAD_SIZE 320
 195
 196 /**
 197  * struct iwl_device_cmd
 198  *
 199  * For allocation of the command and tx queues, this establishes the overall
 200  * size of the largest command we send to uCode, except for commands that
 201  * aren't fully copied and use other TFD space.
 202  */
 203 struct iwl_device_cmd {
 204         struct iwl_cmd_header hdr;      /* uCode API */
 205         u8 payload[DEF_CMD_PAYLOAD_SIZE];
 206 } __packed;
 207
 208 #define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_device_cmd))
 209
 210 #define IWL_MAX_CMD_TFDS        2
 211
 212 /**
 213  * struct iwl_hcmd_dataflag - flag for each one of the chunks of the command
 214  *
 215  * IWL_HCMD_DFL_NOCOPY: By default, the command is copied to the host command's
 216  *      ring. The transport layer doesn't map the command's buffer to DMA, but
 217  *      rather copies it to an previously allocated DMA buffer. This flag tells
 218  *      the transport layer not to copy the command, but to map the existing
 219  *      buffer. This can save memcpy and is worth with very big comamnds.
 220  */
 221 enum iwl_hcmd_dataflag {
 222         IWL_HCMD_DFL_NOCOPY     = BIT(0),
 223 };
 224
 225 /**
 226  * struct iwl_host_cmd - Host command to the uCode
 227  *
 228  * @data: array of chunks that composes the data of the host command
 229  * @resp_pkt: response packet, if %CMD_WANT_SKB was set
 230  * @_rx_page_order: (internally used to free response packet)
 231  * @_rx_page_addr: (internally used to free response packet)
 232  * @handler_status: return value of the handler of the command
 233  *      (put in setup_rx_handlers) - valid for SYNC mode only
 234  * @flags: can be CMD_*
 235  * @len: array of the lenths of the chunks in data
 236  * @dataflags: IWL_HCMD_DFL_*
 237  * @id: id of the host command
 238  */
 239 struct iwl_host_cmd {
 240         const void *data[IWL_MAX_CMD_TFDS];
 241         struct iwl_rx_packet *resp_pkt;
 242         unsigned long _rx_page_addr;
 243         u32 _rx_page_order;
 244         int handler_status;
 245
 246         u32 flags;
 247         u16 len[IWL_MAX_CMD_TFDS];
 248         u8 dataflags[IWL_MAX_CMD_TFDS];
 249         u8 id;
 250 };
 251
 252 static inline void iwl_free_resp(struct iwl_host_cmd *cmd)
 253 {
 254         free_pages(cmd->_rx_page_addr, cmd->_rx_page_order);
 255 }
 256
 257 struct iwl_rx_cmd_buffer {
 258         struct page *_page;
 259         int _offset;
 260         bool _page_stolen;
 261         unsigned int truesize;
 262 };
 263
 264 static inline void *rxb_addr(struct iwl_rx_cmd_buffer *r)
 265 {
 266         return (void *)((unsigned long)page_address(r->_page) + r->_offset);
 267 }
 268
 269 static inline int rxb_offset(struct iwl_rx_cmd_buffer *r)
 270 {
 271         return r->_offset;
 272 }
 273
 274 static inline struct page *rxb_steal_page(struct iwl_rx_cmd_buffer *r)
 275 {
 276         r->_page_stolen = true;
 277         get_page(r->_page);
 278         return r->_page;
 279 }
 280
 281 #define MAX_NO_RECLAIM_CMDS     6
 282
 283 /*
 284  * Maximum number of HW queues the transport layer
 285  * currently supports
 286  */
 287 #define IWL_MAX_HW_QUEUES               32
 288
 289 /**
 290  * struct iwl_trans_config - transport configuration
 291  *
 292  * @op_mode: pointer to the upper layer.
 293  * @queue_to_fifo: queue to FIFO mapping to set up by
 294  *      default
 295  * @n_queue_to_fifo: number of queues to set up
 296  * @cmd_queue: the index of the command queue.
 297  *      Must be set before start_fw.
 298  * @no_reclaim_cmds: Some devices erroneously don't set the
 299  *      SEQ_RX_FRAME bit on some notifications, this is the
 300  *      list of such notifications to filter. Max length is
 301  *      %MAX_NO_RECLAIM_CMDS.
 302  * @n_no_reclaim_cmds: # of commands in list
 303  * @rx_buf_size_8k: 8 kB RX buffer size needed for A-MSDUs,
 304  *      if unset 4k will be the RX buffer size
 305  * @queue_watchdog_timeout: time (in ms) after which queues
 306  *      are considered stuck and will trigger device restart
 307  * @command_names: array of command names, must be 256 entries
 308  *      (one for each command); for debugging only
 309  */
 310 struct iwl_trans_config {
 311         struct iwl_op_mode *op_mode;
 312         const u8 *queue_to_fifo;
 313         u8 n_queue_to_fifo;
 314
 315         u8 cmd_queue;
 316         const u8 *no_reclaim_cmds;
 317         int n_no_reclaim_cmds;
 318
 319         bool rx_buf_size_8k;
 320         unsigned int queue_watchdog_timeout;
 321         const char **command_names;
 322 };
 323
 324 struct iwl_trans;
 325
 326 /**
 327  * struct iwl_trans_ops - transport specific operations
 328  *
 329  * All the handlers MUST be implemented
 330  *
 331  * @start_hw: starts the HW- from that point on, the HW can send interrupts
 332  *      May sleep
 333  * @stop_hw: stops the HW- from that point on, the HW will be in low power but
 334  *      will still issue interrupt if the HW RF kill is triggered unless
 335  *      op_mode_leaving is true.
 336  *      May sleep
 337  * @start_fw: allocates and inits all the resources for the transport
 338  *      layer. Also kick a fw image.
 339  *      May sleep
 340  * @fw_alive: called when the fw sends alive notification
 341  *      May sleep
 342  * @stop_device:stops the whole device (embedded CPU put to reset)
 343  *      May sleep
 344  * @wowlan_suspend: put the device into the correct mode for WoWLAN during
 345  *      suspend. This is optional, if not implemented WoWLAN will not be
 346  *      supported. This callback may sleep.
 347  * @send_cmd:send a host command
 348  *      May sleep only if CMD_SYNC is set
 349  * @tx: send an skb
 350  *      Must be atomic
 351  * @reclaim: free packet until ssn. Returns a list of freed packets.
 352  *      Must be atomic
 353  * @tx_agg_setup: setup a tx queue for AMPDU - will be called once the HW is
 354  *      ready and a successful ADDBA response has been received.
 355  *      May sleep
 356  * @tx_agg_disable: de-configure a Tx queue to send AMPDUs
 357  *      Must be atomic
 358  * @wait_tx_queue_empty: wait until all tx queues are empty
 359  *      May sleep
 360  * @dbgfs_register: add the dbgfs files under this directory. Files will be
 361  *      automatically deleted.
 362  * @suspend: stop the device unless WoWLAN is configured
 363  * @resume: resume activity of the device
 364  * @write8: write a u8 to a register at offset ofs from the BAR
 365  * @write32: write a u32 to a register at offset ofs from the BAR
 366  * @read32: read a u32 register at offset ofs from the BAR
 367  * @configure: configure parameters required by the transport layer from
 368  *      the op_mode. May be called several times before start_fw, can't be
 369  *      called after that.
 370  * @set_pmi: set the power pmi state
 371  */
 372 struct iwl_trans_ops {
 373
 374         int (*start_hw)(struct iwl_trans *iwl_trans);
 375         void (*stop_hw)(struct iwl_trans *iwl_trans, bool op_mode_leaving);
 376         int (*start_fw)(struct iwl_trans *trans, const struct fw_img *fw);
 377         void (*fw_alive)(struct iwl_trans *trans);
 378         void (*stop_device)(struct iwl_trans *trans);
 379
 380         void (*wowlan_suspend)(struct iwl_trans *trans);
 381
 382         int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
 383
 384         int (*tx)(struct iwl_trans *trans, struct sk_buff *skb,
 385                   struct iwl_device_cmd *dev_cmd, int queue);
 386         void (*reclaim)(struct iwl_trans *trans, int queue, int ssn,
 387                         struct sk_buff_head *skbs);
 388
 389         void (*tx_agg_setup)(struct iwl_trans *trans, int queue, int fifo,
 390                              int sta_id, int tid, int frame_limit, u16 ssn);
 391         void (*tx_agg_disable)(struct iwl_trans *trans, int queue);
 392
 393         int (*dbgfs_register)(struct iwl_trans *trans, struct dentry* dir);
 394         int (*wait_tx_queue_empty)(struct iwl_trans *trans);
 395 #ifdef CONFIG_PM_SLEEP
 396         int (*suspend)(struct iwl_trans *trans);
 397         int (*resume)(struct iwl_trans *trans);
 398 #endif
 399         void (*write8)(struct iwl_trans *trans, u32 ofs, u8 val);
 400         void (*write32)(struct iwl_trans *trans, u32 ofs, u32 val);
 401         u32 (*read32)(struct iwl_trans *trans, u32 ofs);
 402         void (*configure)(struct iwl_trans *trans,
 403                           const struct iwl_trans_config *trans_cfg);
 404         void (*set_pmi)(struct iwl_trans *trans, bool state);
 405 };
 406
 407 /**
 408  * enum iwl_trans_state - state of the transport layer
 409  *
 410  * @IWL_TRANS_NO_FW: no fw has sent an alive response
 411  * @IWL_TRANS_FW_ALIVE: a fw has sent an alive response
 412  */
 413 enum iwl_trans_state {
 414         IWL_TRANS_NO_FW = 0,
 415         IWL_TRANS_FW_ALIVE      = 1,
 416 };
 417
 418 /**
 419  * struct iwl_trans - transport common data
 420  *
 421  * @ops - pointer to iwl_trans_ops
 422  * @op_mode - pointer to the op_mode
 423  * @cfg - pointer to the configuration
 424  * @reg_lock - protect hw register access
 425  * @dev - pointer to struct device * that represents the device
 426  * @hw_id: a u32 with the ID of the device / subdevice.
 427  *      Set during transport allocation.
 428  * @hw_id_str: a string with info about HW ID. Set during transport allocation.
 429  * @pm_support: set to true in start_hw if link pm is supported
 430  * @wait_command_queue: the wait_queue for SYNC host commands
 431  */
 432 struct iwl_trans {
 433         const struct iwl_trans_ops *ops;
 434         struct iwl_op_mode *op_mode;
 435         const struct iwl_cfg *cfg;
 436         enum iwl_trans_state state;
 437         spinlock_t reg_lock;
 438
 439         struct device *dev;
 440         u32 hw_rev;
 441         u32 hw_id;
 442         char hw_id_str[52];
 443
 444         bool pm_support;
 445
 446         wait_queue_head_t wait_command_queue;
 447
 448         /* pointer to trans specific struct */
 449         /*Ensure that this pointer will always be aligned to sizeof pointer */
 450         char trans_specific[0] __aligned(sizeof(void *));
 451 };
 452
 453 static inline void iwl_trans_configure(struct iwl_trans *trans,
 454                                        const struct iwl_trans_config *trans_cfg)
 455 {
 456         /*
 457          * only set the op_mode for the moment. Later on, this function will do
 458          * more
 459          */
 460         trans->op_mode = trans_cfg->op_mode;
 461
 462         trans->ops->configure(trans, trans_cfg);
 463 }
 464
 465 static inline int iwl_trans_start_hw(struct iwl_trans *trans)
 466 {
 467         might_sleep();
 468
 469         return trans->ops->start_hw(trans);
 470 }
 471
 472 static inline void iwl_trans_stop_hw(struct iwl_trans *trans,
 473                                      bool op_mode_leaving)
 474 {
 475         might_sleep();
 476
 477         trans->ops->stop_hw(trans, op_mode_leaving);
 478
 479         trans->state = IWL_TRANS_NO_FW;
 480 }
 481
 482 static inline void iwl_trans_fw_alive(struct iwl_trans *trans)
 483 {
 484         might_sleep();
 485
 486         trans->ops->fw_alive(trans);
 487
 488         trans->state = IWL_TRANS_FW_ALIVE;
 489 }
 490
 491 static inline int iwl_trans_start_fw(struct iwl_trans *trans,
 492                                      const struct fw_img *fw)
 493 {
 494         might_sleep();
 495
 496         return trans->ops->start_fw(trans, fw);
 497 }
 498
 499 static inline void iwl_trans_stop_device(struct iwl_trans *trans)
 500 {
 501         might_sleep();
 502
 503         trans->ops->stop_device(trans);
 504
 505         trans->state = IWL_TRANS_NO_FW;
 506 }
 507
 508 static inline void iwl_trans_wowlan_suspend(struct iwl_trans *trans)
 509 {
 510         might_sleep();
 511         trans->ops->wowlan_suspend(trans);
 512 }
 513
 514 static inline int iwl_trans_send_cmd(struct iwl_trans *trans,
 515                                 struct iwl_host_cmd *cmd)
 516 {
 517         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 518                   "%s bad state = %d", __func__, trans->state);
 519
 520         return trans->ops->send_cmd(trans, cmd);
 521 }
 522
 523 static inline int iwl_trans_tx(struct iwl_trans *trans, struct sk_buff *skb,
 524                                struct iwl_device_cmd *dev_cmd, int queue)
 525 {
 526         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 527                   "%s bad state = %d", __func__, trans->state);
 528
 529         return trans->ops->tx(trans, skb, dev_cmd, queue);
 530 }
 531
 532 static inline void iwl_trans_reclaim(struct iwl_trans *trans, int queue,
 533                                      int ssn, struct sk_buff_head *skbs)
 534 {
 535         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 536                   "%s bad state = %d", __func__, trans->state);
 537
 538         trans->ops->reclaim(trans, queue, ssn, skbs);
 539 }
 540
 541 static inline void iwl_trans_tx_agg_disable(struct iwl_trans *trans, int queue)
 542 {
 543         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 544                   "%s bad state = %d", __func__, trans->state);
 545
 546         trans->ops->tx_agg_disable(trans, queue);
 547 }
 548
 549 static inline void iwl_trans_tx_agg_setup(struct iwl_trans *trans, int queue,
 550                                           int fifo, int sta_id, int tid,
 551                                           int frame_limit, u16 ssn)
 552 {
 553         might_sleep();
 554
 555         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 556                   "%s bad state = %d", __func__, trans->state);
 557
 558         trans->ops->tx_agg_setup(trans, queue, fifo, sta_id, tid,
 559                                  frame_limit, ssn);
 560 }
 561
 562 static inline int iwl_trans_wait_tx_queue_empty(struct iwl_trans *trans)
 563 {
 564         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 565                   "%s bad state = %d", __func__, trans->state);
 566
 567         return trans->ops->wait_tx_queue_empty(trans);
 568 }
 569
 570 static inline int iwl_trans_dbgfs_register(struct iwl_trans *trans,
 571                                             struct dentry *dir)
 572 {
 573         return trans->ops->dbgfs_register(trans, dir);
 574 }
 575
 576 #ifdef CONFIG_PM_SLEEP
 577 static inline int iwl_trans_suspend(struct iwl_trans *trans)
 578 {
 579         return trans->ops->suspend(trans);
 580 }
 581
 582 static inline int iwl_trans_resume(struct iwl_trans *trans)
 583 {
 584         return trans->ops->resume(trans);
 585 }
 586 #endif
 587
 588 static inline void iwl_trans_write8(struct iwl_trans *trans, u32 ofs, u8 val)
 589 {
 590         trans->ops->write8(trans, ofs, val);
 591 }
 592
 593 static inline void iwl_trans_write32(struct iwl_trans *trans, u32 ofs, u32 val)
 594 {
 595         trans->ops->write32(trans, ofs, val);
 596 }
 597
 598 static inline u32 iwl_trans_read32(struct iwl_trans *trans, u32 ofs)
 599 {
 600         return trans->ops->read32(trans, ofs);
 601 }
 602
 603 static inline void iwl_trans_set_pmi(struct iwl_trans *trans, bool state)
 604 {
 605         trans->ops->set_pmi(trans, state);
 606 }
 607
 608 /*****************************************************
 609 * driver (transport) register/unregister functions
 610 ******************************************************/
 611 int __must_check iwl_pci_register_driver(void);
 612 void iwl_pci_unregister_driver(void);
 613
 614 #endif /* __iwl_trans_h__ */