1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved. 4 * 5 */ 6 #ifndef _MHI_H_ 7 #define _MHI_H_ 8 9 #include <linux/device.h> 10 #include <linux/dma-direction.h> 11 #include <linux/mutex.h> 12 #include <linux/skbuff.h> 13 #include <linux/slab.h> 14 #include <linux/spinlock.h> 15 #include <linux/wait.h> 16 #include <linux/workqueue.h> 17 18 #define MHI_MAX_OEM_PK_HASH_SEGMENTS 16 19 20 struct mhi_chan; 21 struct mhi_event; 22 struct mhi_ctxt; 23 struct mhi_cmd; 24 struct mhi_buf_info; 25 26 /** 27 * enum mhi_callback - MHI callback 28 * @MHI_CB_IDLE: MHI entered idle state 29 * @MHI_CB_PENDING_DATA: New data available for client to process 30 * @MHI_CB_LPM_ENTER: MHI host entered low power mode 31 * @MHI_CB_LPM_EXIT: MHI host about to exit low power mode 32 * @MHI_CB_EE_RDDM: MHI device entered RDDM exec env 33 * @MHI_CB_EE_MISSION_MODE: MHI device entered Mission Mode exec env 34 * @MHI_CB_SYS_ERROR: MHI device entered error state (may recover) 35 * @MHI_CB_FATAL_ERROR: MHI device entered fatal error state 36 * @MHI_CB_BW_REQ: Received a bandwidth switch request from device 37 */ 38 enum mhi_callback { 39 MHI_CB_IDLE, 40 MHI_CB_PENDING_DATA, 41 MHI_CB_LPM_ENTER, 42 MHI_CB_LPM_EXIT, 43 MHI_CB_EE_RDDM, 44 MHI_CB_EE_MISSION_MODE, 45 MHI_CB_SYS_ERROR, 46 MHI_CB_FATAL_ERROR, 47 MHI_CB_BW_REQ, 48 }; 49 50 /** 51 * enum mhi_flags - Transfer flags 52 * @MHI_EOB: End of buffer for bulk transfer 53 * @MHI_EOT: End of transfer 54 * @MHI_CHAIN: Linked transfer 55 */ 56 enum mhi_flags { 57 MHI_EOB = BIT(0), 58 MHI_EOT = BIT(1), 59 MHI_CHAIN = BIT(2), 60 }; 61 62 /** 63 * enum mhi_device_type - Device types 64 * @MHI_DEVICE_XFER: Handles data transfer 65 * @MHI_DEVICE_CONTROLLER: Control device 66 */ 67 enum mhi_device_type { 68 MHI_DEVICE_XFER, 69 MHI_DEVICE_CONTROLLER, 70 }; 71 72 /** 73 * enum mhi_ch_type - Channel types 74 * @MHI_CH_TYPE_INVALID: Invalid channel type 75 * @MHI_CH_TYPE_OUTBOUND: Outbound channel to the device 76 * @MHI_CH_TYPE_INBOUND: Inbound channel from the device 77 * @MHI_CH_TYPE_INBOUND_COALESCED: Coalesced channel for the device to combine 78 * multiple packets and send them as a single 79 * large packet to reduce CPU consumption 80 */ 81 enum mhi_ch_type { 82 MHI_CH_TYPE_INVALID = 0, 83 MHI_CH_TYPE_OUTBOUND = DMA_TO_DEVICE, 84 MHI_CH_TYPE_INBOUND = DMA_FROM_DEVICE, 85 MHI_CH_TYPE_INBOUND_COALESCED = 3, 86 }; 87 88 /** 89 * struct image_info - Firmware and RDDM table 90 * @mhi_buf: Buffer for firmware and RDDM table 91 * @entries: # of entries in table 92 */ 93 struct image_info { 94 struct mhi_buf *mhi_buf; 95 /* private: from internal.h */ 96 struct bhi_vec_entry *bhi_vec; 97 /* public: */ 98 u32 entries; 99 }; 100 101 /** 102 * struct mhi_link_info - BW requirement 103 * target_link_speed - Link speed as defined by TLS bits in LinkControl reg 104 * target_link_width - Link width as defined by NLW bits in LinkStatus reg 105 */ 106 struct mhi_link_info { 107 unsigned int target_link_speed; 108 unsigned int target_link_width; 109 }; 110 111 /** 112 * enum mhi_ee_type - Execution environment types 113 * @MHI_EE_PBL: Primary Bootloader 114 * @MHI_EE_SBL: Secondary Bootloader 115 * @MHI_EE_AMSS: Modem, aka the primary runtime EE 116 * @MHI_EE_RDDM: Ram dump download mode 117 * @MHI_EE_WFW: WLAN firmware mode 118 * @MHI_EE_PTHRU: Passthrough 119 * @MHI_EE_EDL: Embedded downloader 120 */ 121 enum mhi_ee_type { 122 MHI_EE_PBL, 123 MHI_EE_SBL, 124 MHI_EE_AMSS, 125 MHI_EE_RDDM, 126 MHI_EE_WFW, 127 MHI_EE_PTHRU, 128 MHI_EE_EDL, 129 MHI_EE_MAX_SUPPORTED = MHI_EE_EDL, 130 MHI_EE_DISABLE_TRANSITION, /* local EE, not related to mhi spec */ 131 MHI_EE_NOT_SUPPORTED, 132 MHI_EE_MAX, 133 }; 134 135 /** 136 * enum mhi_state - MHI states 137 * @MHI_STATE_RESET: Reset state 138 * @MHI_STATE_READY: Ready state 139 * @MHI_STATE_M0: M0 state 140 * @MHI_STATE_M1: M1 state 141 * @MHI_STATE_M2: M2 state 142 * @MHI_STATE_M3: M3 state 143 * @MHI_STATE_M3_FAST: M3 Fast state 144 * @MHI_STATE_BHI: BHI state 145 * @MHI_STATE_SYS_ERR: System Error state 146 */ 147 enum mhi_state { 148 MHI_STATE_RESET = 0x0, 149 MHI_STATE_READY = 0x1, 150 MHI_STATE_M0 = 0x2, 151 MHI_STATE_M1 = 0x3, 152 MHI_STATE_M2 = 0x4, 153 MHI_STATE_M3 = 0x5, 154 MHI_STATE_M3_FAST = 0x6, 155 MHI_STATE_BHI = 0x7, 156 MHI_STATE_SYS_ERR = 0xFF, 157 MHI_STATE_MAX, 158 }; 159 160 /** 161 * enum mhi_ch_ee_mask - Execution environment mask for channel 162 * @MHI_CH_EE_PBL: Allow channel to be used in PBL EE 163 * @MHI_CH_EE_SBL: Allow channel to be used in SBL EE 164 * @MHI_CH_EE_AMSS: Allow channel to be used in AMSS EE 165 * @MHI_CH_EE_RDDM: Allow channel to be used in RDDM EE 166 * @MHI_CH_EE_PTHRU: Allow channel to be used in PTHRU EE 167 * @MHI_CH_EE_WFW: Allow channel to be used in WFW EE 168 * @MHI_CH_EE_EDL: Allow channel to be used in EDL EE 169 */ 170 enum mhi_ch_ee_mask { 171 MHI_CH_EE_PBL = BIT(MHI_EE_PBL), 172 MHI_CH_EE_SBL = BIT(MHI_EE_SBL), 173 MHI_CH_EE_AMSS = BIT(MHI_EE_AMSS), 174 MHI_CH_EE_RDDM = BIT(MHI_EE_RDDM), 175 MHI_CH_EE_PTHRU = BIT(MHI_EE_PTHRU), 176 MHI_CH_EE_WFW = BIT(MHI_EE_WFW), 177 MHI_CH_EE_EDL = BIT(MHI_EE_EDL), 178 }; 179 180 /** 181 * enum mhi_er_data_type - Event ring data types 182 * @MHI_ER_DATA: Only client data over this ring 183 * @MHI_ER_CTRL: MHI control data and client data 184 */ 185 enum mhi_er_data_type { 186 MHI_ER_DATA, 187 MHI_ER_CTRL, 188 }; 189 190 /** 191 * enum mhi_db_brst_mode - Doorbell mode 192 * @MHI_DB_BRST_DISABLE: Burst mode disable 193 * @MHI_DB_BRST_ENABLE: Burst mode enable 194 */ 195 enum mhi_db_brst_mode { 196 MHI_DB_BRST_DISABLE = 0x2, 197 MHI_DB_BRST_ENABLE = 0x3, 198 }; 199 200 /** 201 * struct mhi_channel_config - Channel configuration structure for controller 202 * @name: The name of this channel 203 * @num: The number assigned to this channel 204 * @num_elements: The number of elements that can be queued to this channel 205 * @local_elements: The local ring length of the channel 206 * @event_ring: The event rung index that services this channel 207 * @dir: Direction that data may flow on this channel 208 * @type: Channel type 209 * @ee_mask: Execution Environment mask for this channel 210 * @pollcfg: Polling configuration for burst mode. 0 is default. milliseconds 211 for UL channels, multiple of 8 ring elements for DL channels 212 * @doorbell: Doorbell mode 213 * @lpm_notify: The channel master requires low power mode notifications 214 * @offload_channel: The client manages the channel completely 215 * @doorbell_mode_switch: Channel switches to doorbell mode on M0 transition 216 * @auto_queue: Framework will automatically queue buffers for DL traffic 217 * @auto_start: Automatically start (open) this channel 218 * @wake-capable: Channel capable of waking up the system 219 */ 220 struct mhi_channel_config { 221 char *name; 222 u32 num; 223 u32 num_elements; 224 u32 local_elements; 225 u32 event_ring; 226 enum dma_data_direction dir; 227 enum mhi_ch_type type; 228 u32 ee_mask; 229 u32 pollcfg; 230 enum mhi_db_brst_mode doorbell; 231 bool lpm_notify; 232 bool offload_channel; 233 bool doorbell_mode_switch; 234 bool auto_queue; 235 bool auto_start; 236 bool wake_capable; 237 }; 238 239 /** 240 * struct mhi_event_config - Event ring configuration structure for controller 241 * @num_elements: The number of elements that can be queued to this ring 242 * @irq_moderation_ms: Delay irq for additional events to be aggregated 243 * @irq: IRQ associated with this ring 244 * @channel: Dedicated channel number. U32_MAX indicates a non-dedicated ring 245 * @priority: Priority of this ring. Use 1 for now 246 * @mode: Doorbell mode 247 * @data_type: Type of data this ring will process 248 * @hardware_event: This ring is associated with hardware channels 249 * @client_managed: This ring is client managed 250 * @offload_channel: This ring is associated with an offloaded channel 251 */ 252 struct mhi_event_config { 253 u32 num_elements; 254 u32 irq_moderation_ms; 255 u32 irq; 256 u32 channel; 257 u32 priority; 258 enum mhi_db_brst_mode mode; 259 enum mhi_er_data_type data_type; 260 bool hardware_event; 261 bool client_managed; 262 bool offload_channel; 263 }; 264 265 /** 266 * struct mhi_controller_config - Root MHI controller configuration 267 * @max_channels: Maximum number of channels supported 268 * @timeout_ms: Timeout value for operations. 0 means use default 269 * @buf_len: Size of automatically allocated buffers. 0 means use default 270 * @num_channels: Number of channels defined in @ch_cfg 271 * @ch_cfg: Array of defined channels 272 * @num_events: Number of event rings defined in @event_cfg 273 * @event_cfg: Array of defined event rings 274 * @use_bounce_buf: Use a bounce buffer pool due to limited DDR access 275 * @m2_no_db: Host is not allowed to ring DB in M2 state 276 */ 277 struct mhi_controller_config { 278 u32 max_channels; 279 u32 timeout_ms; 280 u32 buf_len; 281 u32 num_channels; 282 const struct mhi_channel_config *ch_cfg; 283 u32 num_events; 284 const struct mhi_event_config *event_cfg; 285 bool use_bounce_buf; 286 bool m2_no_db; 287 }; 288 289 /** 290 * struct mhi_controller - Master MHI controller structure 291 * @cntrl_dev: Pointer to the struct device of physical bus acting as the MHI 292 * controller (required) 293 * @mhi_dev: MHI device instance for the controller 294 * @debugfs_dentry: MHI controller debugfs directory 295 * @regs: Base address of MHI MMIO register space (required) 296 * @bhi: Points to base of MHI BHI register space 297 * @bhie: Points to base of MHI BHIe register space 298 * @wake_db: MHI WAKE doorbell register address 299 * @iova_start: IOMMU starting address for data (required) 300 * @iova_stop: IOMMU stop address for data (required) 301 * @fw_image: Firmware image name for normal booting (required) 302 * @edl_image: Firmware image name for emergency download mode (optional) 303 * @rddm_size: RAM dump size that host should allocate for debugging purpose 304 * @sbl_size: SBL image size downloaded through BHIe (optional) 305 * @seg_len: BHIe vector size (optional) 306 * @fbc_image: Points to firmware image buffer 307 * @rddm_image: Points to RAM dump buffer 308 * @mhi_chan: Points to the channel configuration table 309 * @lpm_chans: List of channels that require LPM notifications 310 * @irq: base irq # to request (required) 311 * @max_chan: Maximum number of channels the controller supports 312 * @total_ev_rings: Total # of event rings allocated 313 * @hw_ev_rings: Number of hardware event rings 314 * @sw_ev_rings: Number of software event rings 315 * @nr_irqs: Number of IRQ allocated by bus master (required) 316 * @family_number: MHI controller family number 317 * @device_number: MHI controller device number 318 * @major_version: MHI controller major revision number 319 * @minor_version: MHI controller minor revision number 320 * @serial_number: MHI controller serial number obtained from BHI 321 * @oem_pk_hash: MHI controller OEM PK Hash obtained from BHI 322 * @mhi_event: MHI event ring configurations table 323 * @mhi_cmd: MHI command ring configurations table 324 * @mhi_ctxt: MHI device context, shared memory between host and device 325 * @pm_mutex: Mutex for suspend/resume operation 326 * @pm_lock: Lock for protecting MHI power management state 327 * @timeout_ms: Timeout in ms for state transitions 328 * @pm_state: MHI power management state 329 * @db_access: DB access states 330 * @ee: MHI device execution environment 331 * @dev_state: MHI device state 332 * @dev_wake: Device wakeup count 333 * @pending_pkts: Pending packets for the controller 334 * @M0, M2, M3: Counters to track number of device MHI state changes 335 * @transition_list: List of MHI state transitions 336 * @transition_lock: Lock for protecting MHI state transition list 337 * @wlock: Lock for protecting device wakeup 338 * @mhi_link_info: Device bandwidth info 339 * @st_worker: State transition worker 340 * @state_event: State change event 341 * @status_cb: CB function to notify power states of the device (required) 342 * @wake_get: CB function to assert device wake (optional) 343 * @wake_put: CB function to de-assert device wake (optional) 344 * @wake_toggle: CB function to assert and de-assert device wake (optional) 345 * @runtime_get: CB function to controller runtime resume (required) 346 * @runtime_put: CB function to decrement pm usage (required) 347 * @map_single: CB function to create TRE buffer 348 * @unmap_single: CB function to destroy TRE buffer 349 * @read_reg: Read a MHI register via the physical link (required) 350 * @write_reg: Write a MHI register via the physical link (required) 351 * @buffer_len: Bounce buffer length 352 * @bounce_buf: Use of bounce buffer 353 * @fbc_download: MHI host needs to do complete image transfer (optional) 354 * @pre_init: MHI host needs to do pre-initialization before power up 355 * @wake_set: Device wakeup set flag 356 * 357 * Fields marked as (required) need to be populated by the controller driver 358 * before calling mhi_register_controller(). For the fields marked as (optional) 359 * they can be populated depending on the usecase. 360 * 361 * The following fields are present for the purpose of implementing any device 362 * specific quirks or customizations for specific MHI revisions used in device 363 * by the controller drivers. The MHI stack will just populate these fields 364 * during mhi_register_controller(): 365 * family_number 366 * device_number 367 * major_version 368 * minor_version 369 */ 370 struct mhi_controller { 371 struct device *cntrl_dev; 372 struct mhi_device *mhi_dev; 373 struct dentry *debugfs_dentry; 374 void __iomem *regs; 375 void __iomem *bhi; 376 void __iomem *bhie; 377 void __iomem *wake_db; 378 379 dma_addr_t iova_start; 380 dma_addr_t iova_stop; 381 const char *fw_image; 382 const char *edl_image; 383 size_t rddm_size; 384 size_t sbl_size; 385 size_t seg_len; 386 struct image_info *fbc_image; 387 struct image_info *rddm_image; 388 struct mhi_chan *mhi_chan; 389 struct list_head lpm_chans; 390 int *irq; 391 u32 max_chan; 392 u32 total_ev_rings; 393 u32 hw_ev_rings; 394 u32 sw_ev_rings; 395 u32 nr_irqs; 396 u32 family_number; 397 u32 device_number; 398 u32 major_version; 399 u32 minor_version; 400 u32 serial_number; 401 u32 oem_pk_hash[MHI_MAX_OEM_PK_HASH_SEGMENTS]; 402 403 struct mhi_event *mhi_event; 404 struct mhi_cmd *mhi_cmd; 405 struct mhi_ctxt *mhi_ctxt; 406 407 struct mutex pm_mutex; 408 rwlock_t pm_lock; 409 u32 timeout_ms; 410 u32 pm_state; 411 u32 db_access; 412 enum mhi_ee_type ee; 413 enum mhi_state dev_state; 414 atomic_t dev_wake; 415 atomic_t pending_pkts; 416 u32 M0, M2, M3; 417 struct list_head transition_list; 418 spinlock_t transition_lock; 419 spinlock_t wlock; 420 struct mhi_link_info mhi_link_info; 421 struct work_struct st_worker; 422 wait_queue_head_t state_event; 423 424 void (*status_cb)(struct mhi_controller *mhi_cntrl, 425 enum mhi_callback cb); 426 void (*wake_get)(struct mhi_controller *mhi_cntrl, bool override); 427 void (*wake_put)(struct mhi_controller *mhi_cntrl, bool override); 428 void (*wake_toggle)(struct mhi_controller *mhi_cntrl); 429 int (*runtime_get)(struct mhi_controller *mhi_cntrl); 430 void (*runtime_put)(struct mhi_controller *mhi_cntrl); 431 int (*map_single)(struct mhi_controller *mhi_cntrl, 432 struct mhi_buf_info *buf); 433 void (*unmap_single)(struct mhi_controller *mhi_cntrl, 434 struct mhi_buf_info *buf); 435 int (*read_reg)(struct mhi_controller *mhi_cntrl, void __iomem *addr, 436 u32 *out); 437 void (*write_reg)(struct mhi_controller *mhi_cntrl, void __iomem *addr, 438 u32 val); 439 440 size_t buffer_len; 441 bool bounce_buf; 442 bool fbc_download; 443 bool pre_init; 444 bool wake_set; 445 }; 446 447 /** 448 * struct mhi_device - Structure representing an MHI device which binds 449 * to channels or is associated with controllers 450 * @id: Pointer to MHI device ID struct 451 * @name: Name of the associated MHI device 452 * @mhi_cntrl: Controller the device belongs to 453 * @ul_chan: UL channel for the device 454 * @dl_chan: DL channel for the device 455 * @dev: Driver model device node for the MHI device 456 * @dev_type: MHI device type 457 * @ul_chan_id: MHI channel id for UL transfer 458 * @dl_chan_id: MHI channel id for DL transfer 459 * @dev_wake: Device wakeup counter 460 */ 461 struct mhi_device { 462 const struct mhi_device_id *id; 463 const char *name; 464 struct mhi_controller *mhi_cntrl; 465 struct mhi_chan *ul_chan; 466 struct mhi_chan *dl_chan; 467 struct device dev; 468 enum mhi_device_type dev_type; 469 int ul_chan_id; 470 int dl_chan_id; 471 u32 dev_wake; 472 }; 473 474 /** 475 * struct mhi_result - Completed buffer information 476 * @buf_addr: Address of data buffer 477 * @bytes_xferd: # of bytes transferred 478 * @dir: Channel direction 479 * @transaction_status: Status of last transaction 480 */ 481 struct mhi_result { 482 void *buf_addr; 483 size_t bytes_xferd; 484 enum dma_data_direction dir; 485 int transaction_status; 486 }; 487 488 /** 489 * struct mhi_buf - MHI Buffer description 490 * @buf: Virtual address of the buffer 491 * @name: Buffer label. For offload channel, configurations name must be: 492 * ECA - Event context array data 493 * CCA - Channel context array data 494 * @dma_addr: IOMMU address of the buffer 495 * @len: # of bytes 496 */ 497 struct mhi_buf { 498 void *buf; 499 const char *name; 500 dma_addr_t dma_addr; 501 size_t len; 502 }; 503 504 /** 505 * struct mhi_driver - Structure representing a MHI client driver 506 * @probe: CB function for client driver probe function 507 * @remove: CB function for client driver remove function 508 * @ul_xfer_cb: CB function for UL data transfer 509 * @dl_xfer_cb: CB function for DL data transfer 510 * @status_cb: CB functions for asynchronous status 511 * @driver: Device driver model driver 512 */ 513 struct mhi_driver { 514 const struct mhi_device_id *id_table; 515 int (*probe)(struct mhi_device *mhi_dev, 516 const struct mhi_device_id *id); 517 void (*remove)(struct mhi_device *mhi_dev); 518 void (*ul_xfer_cb)(struct mhi_device *mhi_dev, 519 struct mhi_result *result); 520 void (*dl_xfer_cb)(struct mhi_device *mhi_dev, 521 struct mhi_result *result); 522 void (*status_cb)(struct mhi_device *mhi_dev, enum mhi_callback mhi_cb); 523 struct device_driver driver; 524 }; 525 526 #define to_mhi_driver(drv) container_of(drv, struct mhi_driver, driver) 527 #define to_mhi_device(dev) container_of(dev, struct mhi_device, dev) 528 529 /** 530 * mhi_alloc_controller - Allocate the MHI Controller structure 531 * Allocate the mhi_controller structure using zero initialized memory 532 */ 533 struct mhi_controller *mhi_alloc_controller(void); 534 535 /** 536 * mhi_free_controller - Free the MHI Controller structure 537 * Free the mhi_controller structure which was previously allocated 538 */ 539 void mhi_free_controller(struct mhi_controller *mhi_cntrl); 540 541 /** 542 * mhi_register_controller - Register MHI controller 543 * @mhi_cntrl: MHI controller to register 544 * @config: Configuration to use for the controller 545 */ 546 int mhi_register_controller(struct mhi_controller *mhi_cntrl, 547 const struct mhi_controller_config *config); 548 549 /** 550 * mhi_unregister_controller - Unregister MHI controller 551 * @mhi_cntrl: MHI controller to unregister 552 */ 553 void mhi_unregister_controller(struct mhi_controller *mhi_cntrl); 554 555 /* 556 * module_mhi_driver() - Helper macro for drivers that don't do 557 * anything special other than using default mhi_driver_register() and 558 * mhi_driver_unregister(). This eliminates a lot of boilerplate. 559 * Each module may only use this macro once. 560 */ 561 #define module_mhi_driver(mhi_drv) \ 562 module_driver(mhi_drv, mhi_driver_register, \ 563 mhi_driver_unregister) 564 565 /* 566 * Macro to avoid include chaining to get THIS_MODULE 567 */ 568 #define mhi_driver_register(mhi_drv) \ 569 __mhi_driver_register(mhi_drv, THIS_MODULE) 570 571 /** 572 * __mhi_driver_register - Register driver with MHI framework 573 * @mhi_drv: Driver associated with the device 574 * @owner: The module owner 575 */ 576 int __mhi_driver_register(struct mhi_driver *mhi_drv, struct module *owner); 577 578 /** 579 * mhi_driver_unregister - Unregister a driver for mhi_devices 580 * @mhi_drv: Driver associated with the device 581 */ 582 void mhi_driver_unregister(struct mhi_driver *mhi_drv); 583 584 /** 585 * mhi_set_mhi_state - Set MHI device state 586 * @mhi_cntrl: MHI controller 587 * @state: State to set 588 */ 589 void mhi_set_mhi_state(struct mhi_controller *mhi_cntrl, 590 enum mhi_state state); 591 592 /** 593 * mhi_notify - Notify the MHI client driver about client device status 594 * @mhi_dev: MHI device instance 595 * @cb_reason: MHI callback reason 596 */ 597 void mhi_notify(struct mhi_device *mhi_dev, enum mhi_callback cb_reason); 598 599 /** 600 * mhi_prepare_for_power_up - Do pre-initialization before power up. 601 * This is optional, call this before power up if 602 * the controller does not want bus framework to 603 * automatically free any allocated memory during 604 * shutdown process. 605 * @mhi_cntrl: MHI controller 606 */ 607 int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl); 608 609 /** 610 * mhi_async_power_up - Start MHI power up sequence 611 * @mhi_cntrl: MHI controller 612 */ 613 int mhi_async_power_up(struct mhi_controller *mhi_cntrl); 614 615 /** 616 * mhi_sync_power_up - Start MHI power up sequence and wait till the device 617 * enters valid EE state 618 * @mhi_cntrl: MHI controller 619 */ 620 int mhi_sync_power_up(struct mhi_controller *mhi_cntrl); 621 622 /** 623 * mhi_power_down - Start MHI power down sequence 624 * @mhi_cntrl: MHI controller 625 * @graceful: Link is still accessible, so do a graceful shutdown process 626 */ 627 void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful); 628 629 /** 630 * mhi_unprepare_after_power_down - Free any allocated memory after power down 631 * @mhi_cntrl: MHI controller 632 */ 633 void mhi_unprepare_after_power_down(struct mhi_controller *mhi_cntrl); 634 635 /** 636 * mhi_pm_suspend - Move MHI into a suspended state 637 * @mhi_cntrl: MHI controller 638 */ 639 int mhi_pm_suspend(struct mhi_controller *mhi_cntrl); 640 641 /** 642 * mhi_pm_resume - Resume MHI from suspended state 643 * @mhi_cntrl: MHI controller 644 */ 645 int mhi_pm_resume(struct mhi_controller *mhi_cntrl); 646 647 /** 648 * mhi_download_rddm_img - Download ramdump image from device for 649 * debugging purpose. 650 * @mhi_cntrl: MHI controller 651 * @in_panic: Download rddm image during kernel panic 652 */ 653 int mhi_download_rddm_img(struct mhi_controller *mhi_cntrl, bool in_panic); 654 655 /** 656 * mhi_force_rddm_mode - Force device into rddm mode 657 * @mhi_cntrl: MHI controller 658 */ 659 int mhi_force_rddm_mode(struct mhi_controller *mhi_cntrl); 660 661 /** 662 * mhi_get_mhi_state - Get MHI state of the device 663 * @mhi_cntrl: MHI controller 664 */ 665 enum mhi_state mhi_get_mhi_state(struct mhi_controller *mhi_cntrl); 666 667 /** 668 * mhi_device_get - Disable device low power mode 669 * @mhi_dev: Device associated with the channel 670 */ 671 void mhi_device_get(struct mhi_device *mhi_dev); 672 673 /** 674 * mhi_device_get_sync - Disable device low power mode. Synchronously 675 * take the controller out of suspended state 676 * @mhi_dev: Device associated with the channel 677 */ 678 int mhi_device_get_sync(struct mhi_device *mhi_dev); 679 680 /** 681 * mhi_device_put - Re-enable device low power mode 682 * @mhi_dev: Device associated with the channel 683 */ 684 void mhi_device_put(struct mhi_device *mhi_dev); 685 686 /** 687 * mhi_prepare_for_transfer - Setup channel for data transfer 688 * @mhi_dev: Device associated with the channels 689 */ 690 int mhi_prepare_for_transfer(struct mhi_device *mhi_dev); 691 692 /** 693 * mhi_unprepare_from_transfer - Unprepare the channels 694 * @mhi_dev: Device associated with the channels 695 */ 696 void mhi_unprepare_from_transfer(struct mhi_device *mhi_dev); 697 698 /** 699 * mhi_poll - Poll for any available data in DL direction 700 * @mhi_dev: Device associated with the channels 701 * @budget: # of events to process 702 */ 703 int mhi_poll(struct mhi_device *mhi_dev, u32 budget); 704 705 /** 706 * mhi_queue_dma - Send or receive DMA mapped buffers from client device 707 * over MHI channel 708 * @mhi_dev: Device associated with the channels 709 * @dir: DMA direction for the channel 710 * @mhi_buf: Buffer for holding the DMA mapped data 711 * @len: Buffer length 712 * @mflags: MHI transfer flags used for the transfer 713 */ 714 int mhi_queue_dma(struct mhi_device *mhi_dev, enum dma_data_direction dir, 715 struct mhi_buf *mhi_buf, size_t len, enum mhi_flags mflags); 716 717 /** 718 * mhi_queue_buf - Send or receive raw buffers from client device over MHI 719 * channel 720 * @mhi_dev: Device associated with the channels 721 * @dir: DMA direction for the channel 722 * @buf: Buffer for holding the data 723 * @len: Buffer length 724 * @mflags: MHI transfer flags used for the transfer 725 */ 726 int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir, 727 void *buf, size_t len, enum mhi_flags mflags); 728 729 /** 730 * mhi_queue_skb - Send or receive SKBs from client device over MHI channel 731 * @mhi_dev: Device associated with the channels 732 * @dir: DMA direction for the channel 733 * @skb: Buffer for holding SKBs 734 * @len: Buffer length 735 * @mflags: MHI transfer flags used for the transfer 736 */ 737 int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir, 738 struct sk_buff *skb, size_t len, enum mhi_flags mflags); 739 740 #endif /* _MHI_H_ */ 741
