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