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