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 #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 #define FH_RSCSR_FRAME_INVALID          0x55550000
 166 #define FH_RSCSR_FRAME_ALIGN            0x40
 167
 168 struct iwl_rx_packet {
 169         /*
 170          * The first 4 bytes of the RX frame header contain both the RX frame
 171          * size and some flags.
 172          * Bit fields:
 173          * 31:    flag flush RB request
 174          * 30:    flag ignore TC (terminal counter) request
 175          * 29:    flag fast IRQ request
 176          * 28-14: Reserved
 177          * 13-00: RX frame size
 178          */
 179         __le32 len_n_flags;
 180         struct iwl_cmd_header hdr;
 181         u8 data[];
 182 } __packed;
 183
 184 /**
 185  * enum CMD_MODE - how to send the host commands ?
 186  *
 187  * @CMD_SYNC: The caller will be stalled until the fw responds to the command
 188  * @CMD_ASYNC: Return right away and don't want for the response
 189  * @CMD_WANT_SKB: valid only with CMD_SYNC. The caller needs the buffer of the
 190  *      response.
 191  * @CMD_ON_DEMAND: This command is sent by the test mode pipe.
 192  */
 193 enum CMD_MODE {
 194         CMD_SYNC = 0,
 195         CMD_ASYNC = BIT(0),
 196         CMD_WANT_SKB = BIT(1),
 197         CMD_ON_DEMAND = BIT(2),
 198 };
 199
 200 #define DEF_CMD_PAYLOAD_SIZE 320
 201
 202 /**
 203  * struct iwl_device_cmd
 204  *
 205  * For allocation of the command and tx queues, this establishes the overall
 206  * size of the largest command we send to uCode, except for commands that
 207  * aren't fully copied and use other TFD space.
 208  */
 209 struct iwl_device_cmd {
 210         struct iwl_cmd_header hdr;      /* uCode API */
 211         u8 payload[DEF_CMD_PAYLOAD_SIZE];
 212 } __packed;
 213
 214 #define TFD_MAX_PAYLOAD_SIZE (sizeof(struct iwl_device_cmd))
 215
 216 #define IWL_MAX_CMD_TFDS        2
 217
 218 /**
 219  * struct iwl_hcmd_dataflag - flag for each one of the chunks of the command
 220  *
 221  * IWL_HCMD_DFL_NOCOPY: By default, the command is copied to the host command's
 222  *      ring. The transport layer doesn't map the command's buffer to DMA, but
 223  *      rather copies it to an previously allocated DMA buffer. This flag tells
 224  *      the transport layer not to copy the command, but to map the existing
 225  *      buffer. This can save memcpy and is worth with very big comamnds.
 226  */
 227 enum iwl_hcmd_dataflag {
 228         IWL_HCMD_DFL_NOCOPY     = BIT(0),
 229 };
 230
 231 /**
 232  * struct iwl_host_cmd - Host command to the uCode
 233  *
 234  * @data: array of chunks that composes the data of the host command
 235  * @resp_pkt: response packet, if %CMD_WANT_SKB was set
 236  * @_rx_page_order: (internally used to free response packet)
 237  * @_rx_page_addr: (internally used to free response packet)
 238  * @handler_status: return value of the handler of the command
 239  *      (put in setup_rx_handlers) - valid for SYNC mode only
 240  * @flags: can be CMD_*
 241  * @len: array of the lenths of the chunks in data
 242  * @dataflags: IWL_HCMD_DFL_*
 243  * @id: id of the host command
 244  */
 245 struct iwl_host_cmd {
 246         const void *data[IWL_MAX_CMD_TFDS];
 247         struct iwl_rx_packet *resp_pkt;
 248         unsigned long _rx_page_addr;
 249         u32 _rx_page_order;
 250         int handler_status;
 251
 252         u32 flags;
 253         u16 len[IWL_MAX_CMD_TFDS];
 254         u8 dataflags[IWL_MAX_CMD_TFDS];
 255         u8 id;
 256 };
 257
 258 static inline void iwl_free_resp(struct iwl_host_cmd *cmd)
 259 {
 260         free_pages(cmd->_rx_page_addr, cmd->_rx_page_order);
 261 }
 262
 263 struct iwl_rx_cmd_buffer {
 264         struct page *_page;
 265         int _offset;
 266         bool _page_stolen;
 267 };
 268
 269 static inline void *rxb_addr(struct iwl_rx_cmd_buffer *r)
 270 {
 271         return (void *)((unsigned long)page_address(r->_page) + r->_offset);
 272 }
 273
 274 static inline int rxb_offset(struct iwl_rx_cmd_buffer *r)
 275 {
 276         return r->_offset;
 277 }
 278
 279 static inline struct page *rxb_steal_page(struct iwl_rx_cmd_buffer *r)
 280 {
 281         r->_page_stolen = true;
 282         get_page(r->_page);
 283         return r->_page;
 284 }
 285
 286 #define MAX_NO_RECLAIM_CMDS     6
 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 /**
 330  * struct iwl_trans_ops - transport specific operations
 331  *
 332  * All the handlers MUST be implemented
 333  *
 334  * @start_hw: starts the HW- from that point on, the HW can send interrupts
 335  *      May sleep
 336  * @stop_hw: stops the HW- from that point on, the HW will be in low power but
 337  *      will still issue interrupt if the HW RF kill is triggered.
 338  *      May sleep
 339  * @start_fw: allocates and inits all the resources for the transport
 340  *      layer. Also kick a fw image.
 341  *      May sleep
 342  * @fw_alive: called when the fw sends alive notification
 343  *      May sleep
 344  * @stop_device:stops the whole device (embedded CPU put to reset)
 345  *      May sleep
 346  * @wowlan_suspend: put the device into the correct mode for WoWLAN during
 347  *      suspend. This is optional, if not implemented WoWLAN will not be
 348  *      supported. This callback may sleep.
 349  * @send_cmd:send a host command
 350  *      May sleep only if CMD_SYNC is set
 351  * @tx: send an skb
 352  *      Must be atomic
 353  * @reclaim: free packet until ssn. Returns a list of freed packets.
 354  *      Must be atomic
 355  * @tx_agg_setup: setup a tx queue for AMPDU - will be called once the HW is
 356  *      ready and a successful ADDBA response has been received.
 357  *      May sleep
 358  * @tx_agg_disable: de-configure a Tx queue to send AMPDUs
 359  *      Must be atomic
 360  * @free: release all the ressource for the transport layer itself such as
 361  *      irq, tasklet etc... From this point on, the device may not issue
 362  *      any interrupt (incl. RFKILL).
 363  *      May sleep
 364  * @wait_tx_queue_empty: wait until all tx queues are empty
 365  *      May sleep
 366  * @dbgfs_register: add the dbgfs files under this directory. Files will be
 367  *      automatically deleted.
 368  * @suspend: stop the device unless WoWLAN is configured
 369  * @resume: resume activity of the device
 370  * @write8: write a u8 to a register at offset ofs from the BAR
 371  * @write32: write a u32 to a register at offset ofs from the BAR
 372  * @read32: read a u32 register at offset ofs from the BAR
 373  * @configure: configure parameters required by the transport layer from
 374  *      the op_mode. May be called several times before start_fw, can't be
 375  *      called after that.
 376  * @set_pmi: set the power pmi state
 377  */
 378 struct iwl_trans_ops {
 379
 380         int (*start_hw)(struct iwl_trans *iwl_trans);
 381         void (*stop_hw)(struct iwl_trans *iwl_trans);
 382         int (*start_fw)(struct iwl_trans *trans, const struct fw_img *fw);
 383         void (*fw_alive)(struct iwl_trans *trans);
 384         void (*stop_device)(struct iwl_trans *trans);
 385
 386         void (*wowlan_suspend)(struct iwl_trans *trans);
 387
 388         int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
 389
 390         int (*tx)(struct iwl_trans *trans, struct sk_buff *skb,
 391                   struct iwl_device_cmd *dev_cmd, int queue);
 392         void (*reclaim)(struct iwl_trans *trans, int queue, int ssn,
 393                         struct sk_buff_head *skbs);
 394
 395         void (*tx_agg_setup)(struct iwl_trans *trans, int queue, int fifo,
 396                              int sta_id, int tid, int frame_limit, u16 ssn);
 397         void (*tx_agg_disable)(struct iwl_trans *trans, int queue);
 398
 399         void (*free)(struct iwl_trans *trans);
 400
 401         int (*dbgfs_register)(struct iwl_trans *trans, struct dentry* dir);
 402         int (*wait_tx_queue_empty)(struct iwl_trans *trans);
 403 #ifdef CONFIG_PM_SLEEP
 404         int (*suspend)(struct iwl_trans *trans);
 405         int (*resume)(struct iwl_trans *trans);
 406 #endif
 407         void (*write8)(struct iwl_trans *trans, u32 ofs, u8 val);
 408         void (*write32)(struct iwl_trans *trans, u32 ofs, u32 val);
 409         u32 (*read32)(struct iwl_trans *trans, u32 ofs);
 410         void (*configure)(struct iwl_trans *trans,
 411                           const struct iwl_trans_config *trans_cfg);
 412         void (*set_pmi)(struct iwl_trans *trans, bool state);
 413 };
 414
 415 /**
 416  * enum iwl_trans_state - state of the transport layer
 417  *
 418  * @IWL_TRANS_NO_FW: no fw has sent an alive response
 419  * @IWL_TRANS_FW_ALIVE: a fw has sent an alive response
 420  */
 421 enum iwl_trans_state {
 422         IWL_TRANS_NO_FW = 0,
 423         IWL_TRANS_FW_ALIVE      = 1,
 424 };
 425
 426 /**
 427  * struct iwl_trans - transport common data
 428  *
 429  * @ops - pointer to iwl_trans_ops
 430  * @op_mode - pointer to the op_mode
 431  * @shrd - pointer to iwl_shared which holds shared data from the upper layer
 432  * @cfg - pointer to the configuration
 433  * @reg_lock - protect hw register access
 434  * @dev - pointer to struct device * that represents the device
 435  * @hw_id: a u32 with the ID of the device / subdevice.
 436  *      Set during transport allocation.
 437  * @hw_id_str: a string with info about HW ID. Set during transport allocation.
 438  * @pm_support: set to true in start_hw if link pm is supported
 439  * @wait_command_queue: the wait_queue for SYNC host commands
 440  */
 441 struct iwl_trans {
 442         const struct iwl_trans_ops *ops;
 443         struct iwl_op_mode *op_mode;
 444         struct iwl_shared *shrd;
 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         /* pointer to trans specific struct */
 459         /*Ensure that this pointer will always be aligned to sizeof pointer */
 460         char trans_specific[0] __aligned(sizeof(void *));
 461 };
 462
 463 static inline void iwl_trans_configure(struct iwl_trans *trans,
 464                                        const struct iwl_trans_config *trans_cfg)
 465 {
 466         /*
 467          * only set the op_mode for the moment. Later on, this function will do
 468          * more
 469          */
 470         trans->op_mode = trans_cfg->op_mode;
 471
 472         trans->ops->configure(trans, trans_cfg);
 473 }
 474
 475 static inline int iwl_trans_start_hw(struct iwl_trans *trans)
 476 {
 477         might_sleep();
 478
 479         return trans->ops->start_hw(trans);
 480 }
 481
 482 static inline void iwl_trans_stop_hw(struct iwl_trans *trans)
 483 {
 484         might_sleep();
 485
 486         trans->ops->stop_hw(trans);
 487
 488         trans->state = IWL_TRANS_NO_FW;
 489 }
 490
 491 static inline void iwl_trans_fw_alive(struct iwl_trans *trans)
 492 {
 493         might_sleep();
 494
 495         trans->ops->fw_alive(trans);
 496
 497         trans->state = IWL_TRANS_FW_ALIVE;
 498 }
 499
 500 static inline int iwl_trans_start_fw(struct iwl_trans *trans,
 501                                      const struct fw_img *fw)
 502 {
 503         might_sleep();
 504
 505         return trans->ops->start_fw(trans, fw);
 506 }
 507
 508 static inline void iwl_trans_stop_device(struct iwl_trans *trans)
 509 {
 510         might_sleep();
 511
 512         trans->ops->stop_device(trans);
 513
 514         trans->state = IWL_TRANS_NO_FW;
 515 }
 516
 517 static inline void iwl_trans_wowlan_suspend(struct iwl_trans *trans)
 518 {
 519         might_sleep();
 520         trans->ops->wowlan_suspend(trans);
 521 }
 522
 523 static inline int iwl_trans_send_cmd(struct iwl_trans *trans,
 524                                 struct iwl_host_cmd *cmd)
 525 {
 526         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 527                   "%s bad state = %d", __func__, trans->state);
 528
 529         return trans->ops->send_cmd(trans, cmd);
 530 }
 531
 532 static inline int iwl_trans_tx(struct iwl_trans *trans, struct sk_buff *skb,
 533                                struct iwl_device_cmd *dev_cmd, int queue)
 534 {
 535         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 536                   "%s bad state = %d", __func__, trans->state);
 537
 538         return trans->ops->tx(trans, skb, dev_cmd, queue);
 539 }
 540
 541 static inline void iwl_trans_reclaim(struct iwl_trans *trans, int queue,
 542                                      int ssn, struct sk_buff_head *skbs)
 543 {
 544         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 545                   "%s bad state = %d", __func__, trans->state);
 546
 547         trans->ops->reclaim(trans, queue, ssn, skbs);
 548 }
 549
 550 static inline void iwl_trans_tx_agg_disable(struct iwl_trans *trans, int queue)
 551 {
 552         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 553                   "%s bad state = %d", __func__, trans->state);
 554
 555         trans->ops->tx_agg_disable(trans, queue);
 556 }
 557
 558 static inline void iwl_trans_tx_agg_setup(struct iwl_trans *trans, int queue,
 559                                           int fifo, int sta_id, int tid,
 560                                           int frame_limit, u16 ssn)
 561 {
 562         might_sleep();
 563
 564         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 565                   "%s bad state = %d", __func__, trans->state);
 566
 567         trans->ops->tx_agg_setup(trans, queue, fifo, sta_id, tid,
 568                                  frame_limit, ssn);
 569 }
 570
 571 static inline void iwl_trans_free(struct iwl_trans *trans)
 572 {
 573         trans->ops->free(trans);
 574 }
 575
 576 static inline int iwl_trans_wait_tx_queue_empty(struct iwl_trans *trans)
 577 {
 578         WARN_ONCE(trans->state != IWL_TRANS_FW_ALIVE,
 579                   "%s bad state = %d", __func__, trans->state);
 580
 581         return trans->ops->wait_tx_queue_empty(trans);
 582 }
 583
 584 static inline int iwl_trans_dbgfs_register(struct iwl_trans *trans,
 585                                             struct dentry *dir)
 586 {
 587         return trans->ops->dbgfs_register(trans, dir);
 588 }
 589
 590 #ifdef CONFIG_PM_SLEEP
 591 static inline int iwl_trans_suspend(struct iwl_trans *trans)
 592 {
 593         return trans->ops->suspend(trans);
 594 }
 595
 596 static inline int iwl_trans_resume(struct iwl_trans *trans)
 597 {
 598         return trans->ops->resume(trans);
 599 }
 600 #endif
 601
 602 static inline void iwl_trans_write8(struct iwl_trans *trans, u32 ofs, u8 val)
 603 {
 604         trans->ops->write8(trans, ofs, val);
 605 }
 606
 607 static inline void iwl_trans_write32(struct iwl_trans *trans, u32 ofs, u32 val)
 608 {
 609         trans->ops->write32(trans, ofs, val);
 610 }
 611
 612 static inline u32 iwl_trans_read32(struct iwl_trans *trans, u32 ofs)
 613 {
 614         return trans->ops->read32(trans, ofs);
 615 }
 616
 617 static inline void iwl_trans_set_pmi(struct iwl_trans *trans, bool state)
 618 {
 619         trans->ops->set_pmi(trans, state);
 620 }
 621
 622 /*****************************************************
 623 * Transport layers implementations + their allocation function
 624 ******************************************************/
 625 struct pci_dev;
 626 struct pci_device_id;
 627 extern const struct iwl_trans_ops trans_ops_pcie;
 628 struct iwl_trans *iwl_trans_pcie_alloc(struct iwl_shared *shrd,
 629                                        struct pci_dev *pdev,
 630                                        const struct pci_device_id *ent,
 631                                        const struct iwl_cfg *cfg);
 632 int __must_check iwl_pci_register_driver(void);
 633 void iwl_pci_unregister_driver(void);
 634
 635 extern const struct iwl_trans_ops trans_ops_idi;
 636 struct iwl_trans *iwl_trans_idi_alloc(struct iwl_shared *shrd,
 637                                       void *pdev_void,
 638                                       const void *ent_void,
 639                                       const struct iwl_cfg *cfg);
 640 #endif /* __iwl_trans_h__ */