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mhi_ep.h
/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (c) 2022, Linaro Ltd. * */ #ifndef _MHI_EP_H_ #define _MHI_EP_H_ #include <linux/dma-direction.h> #include <linux/mhi.h> #define MHI_EP_DEFAULT_MTU 0x8000 /** * struct mhi_ep_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 * @dir: Direction that data may flow on this channel */ struct mhi_ep_channel_config { char *name; u32 num; u32 num_elements; enum dma_data_direction dir; }; /** * struct mhi_ep_cntrl_config - MHI Endpoint controller configuration * @mhi_version: MHI spec version supported by the controller * @max_channels: Maximum number of channels supported * @num_channels: Number of channels defined in @ch_cfg * @ch_cfg: Array of defined channels */ struct mhi_ep_cntrl_config { u32 mhi_version; u32 max_channels; u32 num_channels; const struct mhi_ep_channel_config *ch_cfg; }; /** * struct mhi_ep_db_info - MHI Endpoint doorbell info * @mask: Mask of the doorbell interrupt * @status: Status of the doorbell interrupt */ struct mhi_ep_db_info { u32 mask; u32 status; }; /** * struct mhi_ep_buf_info - MHI Endpoint transfer buffer info * @mhi_dev: MHI device associated with this buffer * @dev_addr: Address of the buffer in endpoint * @host_addr: Address of the bufffer in host * @size: Size of the buffer * @code: Transfer completion code * @cb: Callback to be executed by controller drivers after transfer completion (async) * @cb_buf: Opaque buffer to be passed to the callback */ struct mhi_ep_buf_info { struct mhi_ep_device *mhi_dev; void *dev_addr; u64 host_addr; size_t size; int code; void (*cb)(struct mhi_ep_buf_info *buf_info); void *cb_buf; }; /** * struct mhi_ep_cntrl - MHI Endpoint controller structure * @cntrl_dev: Pointer to the struct device of physical bus acting as the MHI * Endpoint controller * @mhi_dev: MHI Endpoint device instance for the controller * @mmio: MMIO region containing the MHI registers * @mhi_chan: Points to the channel configuration table * @mhi_event: Points to the event ring configurations table * @mhi_cmd: Points to the command ring configurations table * @sm: MHI Endpoint state machine * @ch_ctx_cache: Cache of host channel context data structure * @ev_ctx_cache: Cache of host event context data structure * @cmd_ctx_cache: Cache of host command context data structure * @ch_ctx_host_pa: Physical address of host channel context data structure * @ev_ctx_host_pa: Physical address of host event context data structure * @cmd_ctx_host_pa: Physical address of host command context data structure * @ch_ctx_cache_phys: Physical address of the host channel context cache * @ev_ctx_cache_phys: Physical address of the host event context cache * @cmd_ctx_cache_phys: Physical address of the host command context cache * @chdb: Array of channel doorbell interrupt info * @event_lock: Lock for protecting event rings * @state_lock: Lock for protecting state transitions * @list_lock: Lock for protecting state transition and channel doorbell lists * @st_transition_list: List of state transitions * @ch_db_list: List of queued channel doorbells * @wq: Dedicated workqueue for handling rings and state changes * @state_work: State transition worker * @reset_work: Worker for MHI Endpoint reset * @cmd_ring_work: Worker for processing command rings * @ch_ring_work: Worker for processing channel rings * @raise_irq: CB function for raising IRQ to the host * @alloc_map: CB function for allocating memory in endpoint for storing host context and mapping it * @unmap_free: CB function to unmap and free the allocated memory in endpoint for storing host context * @read_sync: CB function for reading from host memory synchronously * @write_sync: CB function for writing to host memory synchronously * @read_async: CB function for reading from host memory asynchronously * @write_async: CB function for writing to host memory asynchronously * @mhi_state: MHI Endpoint state * @max_chan: Maximum channels supported by the endpoint controller * @mru: MRU (Maximum Receive Unit) value of the endpoint controller * @event_rings: Number of event rings supported by the endpoint controller * @hw_event_rings: Number of hardware event rings supported by the endpoint controller * @chdb_offset: Channel doorbell offset set by the host * @erdb_offset: Event ring doorbell offset set by the host * @index: MHI Endpoint controller index * @irq: IRQ used by the endpoint controller * @enabled: Check if the endpoint controller is enabled or not */ struct mhi_ep_cntrl { struct device *cntrl_dev; struct mhi_ep_device *mhi_dev; void __iomem *mmio; struct mhi_ep_chan *mhi_chan; struct mhi_ep_event *mhi_event; struct mhi_ep_cmd *mhi_cmd; struct mhi_ep_sm *sm; struct mhi_chan_ctxt *ch_ctx_cache; struct mhi_event_ctxt *ev_ctx_cache; struct mhi_cmd_ctxt *cmd_ctx_cache; u64 ch_ctx_host_pa; u64 ev_ctx_host_pa; u64 cmd_ctx_host_pa; phys_addr_t ch_ctx_cache_phys; phys_addr_t ev_ctx_cache_phys; phys_addr_t cmd_ctx_cache_phys; struct mhi_ep_db_info chdb[4]; struct mutex event_lock; struct mutex state_lock; spinlock_t list_lock; struct list_head st_transition_list; struct list_head ch_db_list; struct workqueue_struct *wq; struct work_struct state_work; struct work_struct reset_work; struct work_struct cmd_ring_work; struct work_struct ch_ring_work; struct kmem_cache *ring_item_cache; struct kmem_cache *ev_ring_el_cache; struct kmem_cache *tre_buf_cache; void (*raise_irq)(struct mhi_ep_cntrl *mhi_cntrl, u32 vector); int (*alloc_map)(struct mhi_ep_cntrl *mhi_cntrl, u64 pci_addr, phys_addr_t *phys_ptr, void __iomem **virt, size_t size); void (*unmap_free)(struct mhi_ep_cntrl *mhi_cntrl, u64 pci_addr, phys_addr_t phys, void __iomem *virt, size_t size); int (*read_sync)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info); int (*write_sync)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info); int (*read_async)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info); int (*write_async)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info); enum mhi_state mhi_state; u32 max_chan; u32 mru; u32 event_rings; u32 hw_event_rings; u32 chdb_offset; u32 erdb_offset; u32 index; int irq; bool enabled; }; /** * struct mhi_ep_device - Structure representing an MHI Endpoint device that binds * to channels or is associated with controllers * @dev: Driver model device node for the MHI Endpoint device * @mhi_cntrl: Controller the device belongs to * @id: Pointer to MHI Endpoint device ID struct * @name: Name of the associated MHI Endpoint device * @ul_chan: UL (from host to endpoint) channel for the device * @dl_chan: DL (from endpoint to host) channel for the device * @dev_type: MHI device type */ struct mhi_ep_device { struct device dev; struct mhi_ep_cntrl *mhi_cntrl; const struct mhi_device_id *id; const char *name; struct mhi_ep_chan *ul_chan; struct mhi_ep_chan *dl_chan; enum mhi_device_type dev_type; }; /** * struct mhi_ep_driver - Structure representing a MHI Endpoint client driver * @id_table: Pointer to MHI Endpoint device ID table * @driver: Device driver model driver * @probe: CB function for client driver probe function * @remove: CB function for client driver remove function * @ul_xfer_cb: CB function for UL (from host to endpoint) data transfer * @dl_xfer_cb: CB function for DL (from endpoint to host) data transfer */ struct mhi_ep_driver { const struct mhi_device_id *id_table; struct device_driver driver; int (*probe)(struct mhi_ep_device *mhi_ep, const struct mhi_device_id *id); void (*remove)(struct mhi_ep_device *mhi_ep); void (*ul_xfer_cb)(struct mhi_ep_device *mhi_dev, struct mhi_result *result); void (*dl_xfer_cb)(struct mhi_ep_device *mhi_dev, struct mhi_result *result); }; #define to_mhi_ep_device(dev) container_of(dev, struct mhi_ep_device, dev) #define to_mhi_ep_driver(drv) container_of(drv, struct mhi_ep_driver, driver) /* * module_mhi_ep_driver() - Helper macro for drivers that don't do * anything special other than using default mhi_ep_driver_register() and * mhi_ep_driver_unregister(). This eliminates a lot of boilerplate. * Each module may only use this macro once. */ #define module_mhi_ep_driver(mhi_drv) \ module_driver(mhi_drv, mhi_ep_driver_register, \ mhi_ep_driver_unregister) /* * Macro to avoid include chaining to get THIS_MODULE */ #define mhi_ep_driver_register(mhi_drv) \ __mhi_ep_driver_register(mhi_drv, THIS_MODULE) /** * __mhi_ep_driver_register - Register a driver with MHI Endpoint bus * @mhi_drv: Driver to be associated with the device * @owner: The module owner * * Return: 0 if driver registrations succeeds, a negative error code otherwise. */ int __mhi_ep_driver_register(struct mhi_ep_driver *mhi_drv, struct module *owner); /** * mhi_ep_driver_unregister - Unregister a driver from MHI Endpoint bus * @mhi_drv: Driver associated with the device */ void mhi_ep_driver_unregister(struct mhi_ep_driver *mhi_drv); /** * mhi_ep_register_controller - Register MHI Endpoint controller * @mhi_cntrl: MHI Endpoint controller to register * @config: Configuration to use for the controller * * Return: 0 if controller registrations succeeds, a negative error code otherwise. */ int mhi_ep_register_controller(struct mhi_ep_cntrl *mhi_cntrl, const struct mhi_ep_cntrl_config *config); /** * mhi_ep_unregister_controller - Unregister MHI Endpoint controller * @mhi_cntrl: MHI Endpoint controller to unregister */ void mhi_ep_unregister_controller(struct mhi_ep_cntrl *mhi_cntrl); /** * mhi_ep_power_up - Power up the MHI endpoint stack * @mhi_cntrl: MHI Endpoint controller * * Return: 0 if power up succeeds, a negative error code otherwise. */ int mhi_ep_power_up(struct mhi_ep_cntrl *mhi_cntrl); /** * mhi_ep_power_down - Power down the MHI endpoint stack * @mhi_cntrl: MHI controller */ void mhi_ep_power_down(struct mhi_ep_cntrl *mhi_cntrl); /** * mhi_ep_queue_is_empty - Determine whether the transfer queue is empty * @mhi_dev: Device associated with the channels * @dir: DMA direction for the channel * * Return: true if the queue is empty, false otherwise. */ bool mhi_ep_queue_is_empty(struct mhi_ep_device *mhi_dev, enum dma_data_direction dir); /** * mhi_ep_queue_skb - Send SKBs to host over MHI Endpoint * @mhi_dev: Device associated with the DL channel * @skb: SKBs to be queued * * Return: 0 if the SKBs has been sent successfully, a negative error code otherwise. */ int mhi_ep_queue_skb(struct mhi_ep_device *mhi_dev, struct sk_buff *skb); #endif
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