diff options
Diffstat (limited to 'include/linux/mhi.h')
| -rw-r--r-- | include/linux/mhi.h | 704 |
1 files changed, 704 insertions, 0 deletions
diff --git a/include/linux/mhi.h b/include/linux/mhi.h new file mode 100644 index 000000000000..3d7c3c26eeb9 --- /dev/null +++ b/include/linux/mhi.h @@ -0,0 +1,704 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved. + * + */ +#ifndef _MHI_H_ +#define _MHI_H_ + +#include <linux/device.h> +#include <linux/dma-direction.h> +#include <linux/mutex.h> +#include <linux/rwlock_types.h> +#include <linux/skbuff.h> +#include <linux/slab.h> +#include <linux/spinlock_types.h> +#include <linux/wait.h> +#include <linux/workqueue.h> + +struct mhi_chan; +struct mhi_event; +struct mhi_ctxt; +struct mhi_cmd; +struct mhi_buf_info; + +/** + * enum mhi_callback - MHI callback + * @MHI_CB_IDLE: MHI entered idle state + * @MHI_CB_PENDING_DATA: New data available for client to process + * @MHI_CB_LPM_ENTER: MHI host entered low power mode + * @MHI_CB_LPM_EXIT: MHI host about to exit low power mode + * @MHI_CB_EE_RDDM: MHI device entered RDDM exec env + * @MHI_CB_EE_MISSION_MODE: MHI device entered Mission Mode exec env + * @MHI_CB_SYS_ERROR: MHI device entered error state (may recover) + * @MHI_CB_FATAL_ERROR: MHI device entered fatal error state + * @MHI_CB_BW_REQ: Received a bandwidth switch request from device + */ +enum mhi_callback { + MHI_CB_IDLE, + MHI_CB_PENDING_DATA, + MHI_CB_LPM_ENTER, + MHI_CB_LPM_EXIT, + MHI_CB_EE_RDDM, + MHI_CB_EE_MISSION_MODE, + MHI_CB_SYS_ERROR, + MHI_CB_FATAL_ERROR, + MHI_CB_BW_REQ, +}; + +/** + * enum mhi_flags - Transfer flags + * @MHI_EOB: End of buffer for bulk transfer + * @MHI_EOT: End of transfer + * @MHI_CHAIN: Linked transfer + */ +enum mhi_flags { + MHI_EOB = BIT(0), + MHI_EOT = BIT(1), + MHI_CHAIN = BIT(2), +}; + +/** + * enum mhi_device_type - Device types + * @MHI_DEVICE_XFER: Handles data transfer + * @MHI_DEVICE_CONTROLLER: Control device + */ +enum mhi_device_type { + MHI_DEVICE_XFER, + MHI_DEVICE_CONTROLLER, +}; + +/** + * enum mhi_ch_type - Channel types + * @MHI_CH_TYPE_INVALID: Invalid channel type + * @MHI_CH_TYPE_OUTBOUND: Outbound channel to the device + * @MHI_CH_TYPE_INBOUND: Inbound channel from the device + * @MHI_CH_TYPE_INBOUND_COALESCED: Coalesced channel for the device to combine + * multiple packets and send them as a single + * large packet to reduce CPU consumption + */ +enum mhi_ch_type { + MHI_CH_TYPE_INVALID = 0, + MHI_CH_TYPE_OUTBOUND = DMA_TO_DEVICE, + MHI_CH_TYPE_INBOUND = DMA_FROM_DEVICE, + MHI_CH_TYPE_INBOUND_COALESCED = 3, +}; + +/** + * struct image_info - Firmware and RDDM table table + * @mhi_buf - Buffer for firmware and RDDM table + * @entries - # of entries in table + */ +struct image_info { + struct mhi_buf *mhi_buf; + struct bhi_vec_entry *bhi_vec; + u32 entries; +}; + +/** + * struct mhi_link_info - BW requirement + * target_link_speed - Link speed as defined by TLS bits in LinkControl reg + * target_link_width - Link width as defined by NLW bits in LinkStatus reg + */ +struct mhi_link_info { + unsigned int target_link_speed; + unsigned int target_link_width; +}; + +/** + * enum mhi_ee_type - Execution environment types + * @MHI_EE_PBL: Primary Bootloader + * @MHI_EE_SBL: Secondary Bootloader + * @MHI_EE_AMSS: Modem, aka the primary runtime EE + * @MHI_EE_RDDM: Ram dump download mode + * @MHI_EE_WFW: WLAN firmware mode + * @MHI_EE_PTHRU: Passthrough + * @MHI_EE_EDL: Embedded downloader + */ +enum mhi_ee_type { + MHI_EE_PBL, + MHI_EE_SBL, + MHI_EE_AMSS, + MHI_EE_RDDM, + MHI_EE_WFW, + MHI_EE_PTHRU, + MHI_EE_EDL, + MHI_EE_MAX_SUPPORTED = MHI_EE_EDL, + MHI_EE_DISABLE_TRANSITION, /* local EE, not related to mhi spec */ + MHI_EE_NOT_SUPPORTED, + MHI_EE_MAX, +}; + +/** + * enum mhi_state - MHI states + * @MHI_STATE_RESET: Reset state + * @MHI_STATE_READY: Ready state + * @MHI_STATE_M0: M0 state + * @MHI_STATE_M1: M1 state + * @MHI_STATE_M2: M2 state + * @MHI_STATE_M3: M3 state + * @MHI_STATE_M3_FAST: M3 Fast state + * @MHI_STATE_BHI: BHI state + * @MHI_STATE_SYS_ERR: System Error state + */ +enum mhi_state { + MHI_STATE_RESET = 0x0, + MHI_STATE_READY = 0x1, + MHI_STATE_M0 = 0x2, + MHI_STATE_M1 = 0x3, + MHI_STATE_M2 = 0x4, + MHI_STATE_M3 = 0x5, + MHI_STATE_M3_FAST = 0x6, + MHI_STATE_BHI = 0x7, + MHI_STATE_SYS_ERR = 0xFF, + MHI_STATE_MAX, +}; + +/** + * enum mhi_ch_ee_mask - Execution environment mask for channel + * @MHI_CH_EE_PBL: Allow channel to be used in PBL EE + * @MHI_CH_EE_SBL: Allow channel to be used in SBL EE + * @MHI_CH_EE_AMSS: Allow channel to be used in AMSS EE + * @MHI_CH_EE_RDDM: Allow channel to be used in RDDM EE + * @MHI_CH_EE_PTHRU: Allow channel to be used in PTHRU EE + * @MHI_CH_EE_WFW: Allow channel to be used in WFW EE + * @MHI_CH_EE_EDL: Allow channel to be used in EDL EE + */ +enum mhi_ch_ee_mask { + MHI_CH_EE_PBL = BIT(MHI_EE_PBL), + MHI_CH_EE_SBL = BIT(MHI_EE_SBL), + MHI_CH_EE_AMSS = BIT(MHI_EE_AMSS), + MHI_CH_EE_RDDM = BIT(MHI_EE_RDDM), + MHI_CH_EE_PTHRU = BIT(MHI_EE_PTHRU), + MHI_CH_EE_WFW = BIT(MHI_EE_WFW), + MHI_CH_EE_EDL = BIT(MHI_EE_EDL), +}; + +/** + * enum mhi_er_data_type - Event ring data types + * @MHI_ER_DATA: Only client data over this ring + * @MHI_ER_CTRL: MHI control data and client data + */ +enum mhi_er_data_type { + MHI_ER_DATA, + MHI_ER_CTRL, +}; + +/** + * enum mhi_db_brst_mode - Doorbell mode + * @MHI_DB_BRST_DISABLE: Burst mode disable + * @MHI_DB_BRST_ENABLE: Burst mode enable + */ +enum mhi_db_brst_mode { + MHI_DB_BRST_DISABLE = 0x2, + MHI_DB_BRST_ENABLE = 0x3, +}; + +/** + * struct mhi_channel_config - Channel configuration structure for controller + * @name: The name of this channel + * @num: The number assigned to this channel + * @num_elements: The number of elements that can be queued to this channel + * @local_elements: The local ring length of the channel + * @event_ring: The event rung index that services this channel + * @dir: Direction that data may flow on this channel + * @type: Channel type + * @ee_mask: Execution Environment mask for this channel + * @pollcfg: Polling configuration for burst mode. 0 is default. milliseconds + for UL channels, multiple of 8 ring elements for DL channels + * @doorbell: Doorbell mode + * @lpm_notify: The channel master requires low power mode notifications + * @offload_channel: The client manages the channel completely + * @doorbell_mode_switch: Channel switches to doorbell mode on M0 transition + * @auto_queue: Framework will automatically queue buffers for DL traffic + * @auto_start: Automatically start (open) this channel + * @wake-capable: Channel capable of waking up the system + */ +struct mhi_channel_config { + char *name; + u32 num; + u32 num_elements; + u32 local_elements; + u32 event_ring; + enum dma_data_direction dir; + enum mhi_ch_type type; + u32 ee_mask; + u32 pollcfg; + enum mhi_db_brst_mode doorbell; + bool lpm_notify; + bool offload_channel; + bool doorbell_mode_switch; + bool auto_queue; + bool auto_start; + bool wake_capable; +}; + +/** + * struct mhi_event_config - Event ring configuration structure for controller + * @num_elements: The number of elements that can be queued to this ring + * @irq_moderation_ms: Delay irq for additional events to be aggregated + * @irq: IRQ associated with this ring + * @channel: Dedicated channel number. U32_MAX indicates a non-dedicated ring + * @priority: Priority of this ring. Use 1 for now + * @mode: Doorbell mode + * @data_type: Type of data this ring will process + * @hardware_event: This ring is associated with hardware channels + * @client_managed: This ring is client managed + * @offload_channel: This ring is associated with an offloaded channel + */ +struct mhi_event_config { + u32 num_elements; + u32 irq_moderation_ms; + u32 irq; + u32 channel; + u32 priority; + enum mhi_db_brst_mode mode; + enum mhi_er_data_type data_type; + bool hardware_event; + bool client_managed; + bool offload_channel; +}; + +/** + * struct mhi_controller_config - Root MHI controller configuration + * @max_channels: Maximum number of channels supported + * @timeout_ms: Timeout value for operations. 0 means use default + * @buf_len: Size of automatically allocated buffers. 0 means use default + * @num_channels: Number of channels defined in @ch_cfg + * @ch_cfg: Array of defined channels + * @num_events: Number of event rings defined in @event_cfg + * @event_cfg: Array of defined event rings + * @use_bounce_buf: Use a bounce buffer pool due to limited DDR access + * @m2_no_db: Host is not allowed to ring DB in M2 state + */ +struct mhi_controller_config { + u32 max_channels; + u32 timeout_ms; + u32 buf_len; + u32 num_channels; + struct mhi_channel_config *ch_cfg; + u32 num_events; + struct mhi_event_config *event_cfg; + bool use_bounce_buf; + bool m2_no_db; +}; + +/** + * struct mhi_controller - Master MHI controller structure + * @cntrl_dev: Pointer to the struct device of physical bus acting as the MHI + * controller (required) + * @mhi_dev: MHI device instance for the controller + * @regs: Base address of MHI MMIO register space (required) + * @bhi: Points to base of MHI BHI register space + * @bhie: Points to base of MHI BHIe register space + * @wake_db: MHI WAKE doorbell register address + * @iova_start: IOMMU starting address for data (required) + * @iova_stop: IOMMU stop address for data (required) + * @fw_image: Firmware image name for normal booting (required) + * @edl_image: Firmware image name for emergency download mode (optional) + * @rddm_size: RAM dump size that host should allocate for debugging purpose + * @sbl_size: SBL image size downloaded through BHIe (optional) + * @seg_len: BHIe vector size (optional) + * @fbc_image: Points to firmware image buffer + * @rddm_image: Points to RAM dump buffer + * @mhi_chan: Points to the channel configuration table + * @lpm_chans: List of channels that require LPM notifications + * @irq: base irq # to request (required) + * @max_chan: Maximum number of channels the controller supports + * @total_ev_rings: Total # of event rings allocated + * @hw_ev_rings: Number of hardware event rings + * @sw_ev_rings: Number of software event rings + * @nr_irqs_req: Number of IRQs required to operate (optional) + * @nr_irqs: Number of IRQ allocated by bus master (required) + * @family_number: MHI controller family number + * @device_number: MHI controller device number + * @major_version: MHI controller major revision number + * @minor_version: MHI controller minor revision number + * @mhi_event: MHI event ring configurations table + * @mhi_cmd: MHI command ring configurations table + * @mhi_ctxt: MHI device context, shared memory between host and device + * @pm_mutex: Mutex for suspend/resume operation + * @pm_lock: Lock for protecting MHI power management state + * @timeout_ms: Timeout in ms for state transitions + * @pm_state: MHI power management state + * @db_access: DB access states + * @ee: MHI device execution environment + * @dev_state: MHI device state + * @dev_wake: Device wakeup count + * @pending_pkts: Pending packets for the controller + * @transition_list: List of MHI state transitions + * @transition_lock: Lock for protecting MHI state transition list + * @wlock: Lock for protecting device wakeup + * @mhi_link_info: Device bandwidth info + * @st_worker: State transition worker + * @fw_worker: Firmware download worker + * @syserr_worker: System error worker + * @state_event: State change event + * @status_cb: CB function to notify power states of the device (required) + * @wake_get: CB function to assert device wake (optional) + * @wake_put: CB function to de-assert device wake (optional) + * @wake_toggle: CB function to assert and de-assert device wake (optional) + * @runtime_get: CB function to controller runtime resume (required) + * @runtime_put: CB function to decrement pm usage (required) + * @map_single: CB function to create TRE buffer + * @unmap_single: CB function to destroy TRE buffer + * @read_reg: Read a MHI register via the physical link (required) + * @write_reg: Write a MHI register via the physical link (required) + * @buffer_len: Bounce buffer length + * @bounce_buf: Use of bounce buffer + * @fbc_download: MHI host needs to do complete image transfer (optional) + * @pre_init: MHI host needs to do pre-initialization before power up + * @wake_set: Device wakeup set flag + * + * Fields marked as (required) need to be populated by the controller driver + * before calling mhi_register_controller(). For the fields marked as (optional) + * they can be populated depending on the usecase. + * + * The following fields are present for the purpose of implementing any device + * specific quirks or customizations for specific MHI revisions used in device + * by the controller drivers. The MHI stack will just populate these fields + * during mhi_register_controller(): + * family_number + * device_number + * major_version + * minor_version + */ +struct mhi_controller { + struct device *cntrl_dev; + struct mhi_device *mhi_dev; + void __iomem *regs; + void __iomem *bhi; + void __iomem *bhie; + void __iomem *wake_db; + + dma_addr_t iova_start; + dma_addr_t iova_stop; + const char *fw_image; + const char *edl_image; + size_t rddm_size; + size_t sbl_size; + size_t seg_len; + struct image_info *fbc_image; + struct image_info *rddm_image; + struct mhi_chan *mhi_chan; + struct list_head lpm_chans; + int *irq; + u32 max_chan; + u32 total_ev_rings; + u32 hw_ev_rings; + u32 sw_ev_rings; + u32 nr_irqs_req; + u32 nr_irqs; + u32 family_number; + u32 device_number; + u32 major_version; + u32 minor_version; + + struct mhi_event *mhi_event; + struct mhi_cmd *mhi_cmd; + struct mhi_ctxt *mhi_ctxt; + + struct mutex pm_mutex; + rwlock_t pm_lock; + u32 timeout_ms; + u32 pm_state; + u32 db_access; + enum mhi_ee_type ee; + enum mhi_state dev_state; + atomic_t dev_wake; + atomic_t pending_pkts; + struct list_head transition_list; + spinlock_t transition_lock; + spinlock_t wlock; + struct mhi_link_info mhi_link_info; + struct work_struct st_worker; + struct work_struct fw_worker; + struct work_struct syserr_worker; + wait_queue_head_t state_event; + + void (*status_cb)(struct mhi_controller *mhi_cntrl, + enum mhi_callback cb); + void (*wake_get)(struct mhi_controller *mhi_cntrl, bool override); + void (*wake_put)(struct mhi_controller *mhi_cntrl, bool override); + void (*wake_toggle)(struct mhi_controller *mhi_cntrl); + int (*runtime_get)(struct mhi_controller *mhi_cntrl); + void (*runtime_put)(struct mhi_controller *mhi_cntrl); + int (*map_single)(struct mhi_controller *mhi_cntrl, + struct mhi_buf_info *buf); + void (*unmap_single)(struct mhi_controller *mhi_cntrl, + struct mhi_buf_info *buf); + int (*read_reg)(struct mhi_controller *mhi_cntrl, void __iomem *addr, + u32 *out); + void (*write_reg)(struct mhi_controller *mhi_cntrl, void __iomem *addr, + u32 val); + + size_t buffer_len; + bool bounce_buf; + bool fbc_download; + bool pre_init; + bool wake_set; +}; + +/** + * struct mhi_device - Structure representing a MHI device which binds + * to channels + * @id: Pointer to MHI device ID struct + * @chan_name: Name of the channel to which the device binds + * @mhi_cntrl: Controller the device belongs to + * @ul_chan: UL channel for the device + * @dl_chan: DL channel for the device + * @dev: Driver model device node for the MHI device + * @dev_type: MHI device type + * @ul_chan_id: MHI channel id for UL transfer + * @dl_chan_id: MHI channel id for DL transfer + * @dev_wake: Device wakeup counter + */ +struct mhi_device { + const struct mhi_device_id *id; + const char *chan_name; + struct mhi_controller *mhi_cntrl; + struct mhi_chan *ul_chan; + struct mhi_chan *dl_chan; + struct device dev; + enum mhi_device_type dev_type; + int ul_chan_id; + int dl_chan_id; + u32 dev_wake; +}; + +/** + * struct mhi_result - Completed buffer information + * @buf_addr: Address of data buffer + * @bytes_xferd: # of bytes transferred + * @dir: Channel direction + * @transaction_status: Status of last transaction + */ +struct mhi_result { + void *buf_addr; + size_t bytes_xferd; + enum dma_data_direction dir; + int transaction_status; +}; + +/** + * struct mhi_buf - MHI Buffer description + * @buf: Virtual address of the buffer + * @name: Buffer label. For offload channel, configurations name must be: + * ECA - Event context array data + * CCA - Channel context array data + * @dma_addr: IOMMU address of the buffer + * @len: # of bytes + */ +struct mhi_buf { + void *buf; + const char *name; + dma_addr_t dma_addr; + size_t len; +}; + +/** + * struct mhi_driver - Structure representing a MHI client driver + * @probe: CB function for client driver probe function + * @remove: CB function for client driver remove function + * @ul_xfer_cb: CB function for UL data transfer + * @dl_xfer_cb: CB function for DL data transfer + * @status_cb: CB functions for asynchronous status + * @driver: Device driver model driver + */ +struct mhi_driver { + const struct mhi_device_id *id_table; + int (*probe)(struct mhi_device *mhi_dev, + const struct mhi_device_id *id); + void (*remove)(struct mhi_device *mhi_dev); + void (*ul_xfer_cb)(struct mhi_device *mhi_dev, + struct mhi_result *result); + void (*dl_xfer_cb)(struct mhi_device *mhi_dev, + struct mhi_result *result); + void (*status_cb)(struct mhi_device *mhi_dev, enum mhi_callback mhi_cb); + struct device_driver driver; +}; + +#define to_mhi_driver(drv) container_of(drv, struct mhi_driver, driver) +#define to_mhi_device(dev) container_of(dev, struct mhi_device, dev) + +/** + * mhi_register_controller - Register MHI controller + * @mhi_cntrl: MHI controller to register + * @config: Configuration to use for the controller + */ +int mhi_register_controller(struct mhi_controller *mhi_cntrl, + struct mhi_controller_config *config); + +/** + * mhi_unregister_controller - Unregister MHI controller + * @mhi_cntrl: MHI controller to unregister + */ +void mhi_unregister_controller(struct mhi_controller *mhi_cntrl); + +/* + * module_mhi_driver() - Helper macro for drivers that don't do + * anything special other than using default mhi_driver_register() and + * mhi_driver_unregister(). This eliminates a lot of boilerplate. + * Each module may only use this macro once. + */ +#define module_mhi_driver(mhi_drv) \ + module_driver(mhi_drv, mhi_driver_register, \ + mhi_driver_unregister) + +/* + * Macro to avoid include chaining to get THIS_MODULE + */ +#define mhi_driver_register(mhi_drv) \ + __mhi_driver_register(mhi_drv, THIS_MODULE) + +/** + * __mhi_driver_register - Register driver with MHI framework + * @mhi_drv: Driver associated with the device + * @owner: The module owner + */ +int __mhi_driver_register(struct mhi_driver *mhi_drv, struct module *owner); + +/** + * mhi_driver_unregister - Unregister a driver for mhi_devices + * @mhi_drv: Driver associated with the device + */ +void mhi_driver_unregister(struct mhi_driver *mhi_drv); + +/** + * mhi_set_mhi_state - Set MHI device state + * @mhi_cntrl: MHI controller + * @state: State to set + */ +void mhi_set_mhi_state(struct mhi_controller *mhi_cntrl, + enum mhi_state state); + +/** + * mhi_prepare_for_power_up - Do pre-initialization before power up. + * This is optional, call this before power up if + * the controller does not want bus framework to + * automatically free any allocated memory during + * shutdown process. + * @mhi_cntrl: MHI controller + */ +int mhi_prepare_for_power_up(struct mhi_controller *mhi_cntrl); + +/** + * mhi_async_power_up - Start MHI power up sequence + * @mhi_cntrl: MHI controller + */ +int mhi_async_power_up(struct mhi_controller *mhi_cntrl); + +/** + * mhi_sync_power_up - Start MHI power up sequence and wait till the device + * device enters valid EE state + * @mhi_cntrl: MHI controller + */ +int mhi_sync_power_up(struct mhi_controller *mhi_cntrl); + +/** + * mhi_power_down - Start MHI power down sequence + * @mhi_cntrl: MHI controller + * @graceful: Link is still accessible, so do a graceful shutdown process + */ +void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful); + +/** + * mhi_unprepare_after_power_down - Free any allocated memory after power down + * @mhi_cntrl: MHI controller + */ +void mhi_unprepare_after_power_down(struct mhi_controller *mhi_cntrl); + +/** + * mhi_download_rddm_img - Download ramdump image from device for + * debugging purpose. + * @mhi_cntrl: MHI controller + * @in_panic: Download rddm image during kernel panic + */ +int mhi_download_rddm_img(struct mhi_controller *mhi_cntrl, bool in_panic); + +/** + * mhi_force_rddm_mode - Force device into rddm mode + * @mhi_cntrl: MHI controller + */ +int mhi_force_rddm_mode(struct mhi_controller *mhi_cntrl); + +/** + * mhi_get_mhi_state - Get MHI state of the device + * @mhi_cntrl: MHI controller + */ +enum mhi_state mhi_get_mhi_state(struct mhi_controller *mhi_cntrl); + +/** + * mhi_device_get - Disable device low power mode + * @mhi_dev: Device associated with the channel + */ +void mhi_device_get(struct mhi_device *mhi_dev); + +/** + * mhi_device_get_sync - Disable device low power mode. Synchronously + * take the controller out of suspended state + * @mhi_dev: Device associated with the channel + */ +int mhi_device_get_sync(struct mhi_device *mhi_dev); + +/** + * mhi_device_put - Re-enable device low power mode + * @mhi_dev: Device associated with the channel + */ +void mhi_device_put(struct mhi_device *mhi_dev); + +/** + * mhi_prepare_for_transfer - Setup channel for data transfer + * @mhi_dev: Device associated with the channels + */ +int mhi_prepare_for_transfer(struct mhi_device *mhi_dev); + +/** + * mhi_unprepare_from_transfer - Unprepare the channels + * @mhi_dev: Device associated with the channels + */ +void mhi_unprepare_from_transfer(struct mhi_device *mhi_dev); + +/** + * mhi_poll - Poll for any available data in DL direction + * @mhi_dev: Device associated with the channels + * @budget: # of events to process + */ +int mhi_poll(struct mhi_device *mhi_dev, u32 budget); + +/** + * mhi_queue_dma - Send or receive DMA mapped buffers from client device + * over MHI channel + * @mhi_dev: Device associated with the channels + * @dir: DMA direction for the channel + * @mhi_buf: Buffer for holding the DMA mapped data + * @len: Buffer length + * @mflags: MHI transfer flags used for the transfer + */ +int mhi_queue_dma(struct mhi_device *mhi_dev, enum dma_data_direction dir, + struct mhi_buf *mhi_buf, size_t len, enum mhi_flags mflags); + +/** + * mhi_queue_buf - Send or receive raw buffers from client device over MHI + * channel + * @mhi_dev: Device associated with the channels + * @dir: DMA direction for the channel + * @buf: Buffer for holding the data + * @len: Buffer length + * @mflags: MHI transfer flags used for the transfer + */ +int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir, + void *buf, size_t len, enum mhi_flags mflags); + +/** + * mhi_queue_skb - Send or receive SKBs from client device over MHI channel + * @mhi_dev: Device associated with the channels + * @dir: DMA direction for the channel + * @skb: Buffer for holding SKBs + * @len: Buffer length + * @mflags: MHI transfer flags used for the transfer + */ +int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir, + struct sk_buff *skb, size_t len, enum mhi_flags mflags); + +#endif /* _MHI_H_ */ |