1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2022, Linaro Ltd. 4 * 5 */ 6 #ifndef _MHI_EP_H_ 7 #define _MHI_EP_H_ 8 9 #include <linux/dma-direction.h> 10 #include <linux/mhi.h> 11 12 #define MHI_EP_DEFAULT_MTU 0x8000 13 14 /** 15 * struct mhi_ep_channel_config - Channel configuration structure for controller 16 * @name: The name of this channel 17 * @num: The number assigned to this channel 18 * @num_elements: The number of elements that can be queued to this channel 19 * @dir: Direction that data may flow on this channel 20 */ 21 struct mhi_ep_channel_config { 22 char *name; 23 u32 num; 24 u32 num_elements; 25 enum dma_data_direction dir; 26 }; 27 28 /** 29 * struct mhi_ep_cntrl_config - MHI Endpoint controller configuration 30 * @mhi_version: MHI spec version supported by the controller 31 * @max_channels: Maximum number of channels supported 32 * @num_channels: Number of channels defined in @ch_cfg 33 * @ch_cfg: Array of defined channels 34 */ 35 struct mhi_ep_cntrl_config { 36 u32 mhi_version; 37 u32 max_channels; 38 u32 num_channels; 39 const struct mhi_ep_channel_config *ch_cfg; 40 }; 41 42 /** 43 * struct mhi_ep_db_info - MHI Endpoint doorbell info 44 * @mask: Mask of the doorbell interrupt 45 * @status: Status of the doorbell interrupt 46 */ 47 struct mhi_ep_db_info { 48 u32 mask; 49 u32 status; 50 }; 51 52 /** 53 * struct mhi_ep_buf_info - MHI Endpoint transfer buffer info 54 * @mhi_dev: MHI device associated with this buffer 55 * @dev_addr: Address of the buffer in endpoint 56 * @host_addr: Address of the bufffer in host 57 * @size: Size of the buffer 58 * @code: Transfer completion code 59 * @cb: Callback to be executed by controller drivers after transfer completion (async) 60 * @cb_buf: Opaque buffer to be passed to the callback 61 */ 62 struct mhi_ep_buf_info { 63 struct mhi_ep_device *mhi_dev; 64 void *dev_addr; 65 u64 host_addr; 66 size_t size; 67 int code; 68 69 void (*cb)(struct mhi_ep_buf_info *buf_info); 70 void *cb_buf; 71 }; 72 73 /** 74 * struct mhi_ep_cntrl - MHI Endpoint controller structure 75 * @cntrl_dev: Pointer to the struct device of physical bus acting as the MHI 76 * Endpoint controller 77 * @mhi_dev: MHI Endpoint device instance for the controller 78 * @mmio: MMIO region containing the MHI registers 79 * @mhi_chan: Points to the channel configuration table 80 * @mhi_event: Points to the event ring configurations table 81 * @mhi_cmd: Points to the command ring configurations table 82 * @sm: MHI Endpoint state machine 83 * @ch_ctx_cache: Cache of host channel context data structure 84 * @ev_ctx_cache: Cache of host event context data structure 85 * @cmd_ctx_cache: Cache of host command context data structure 86 * @ch_ctx_host_pa: Physical address of host channel context data structure 87 * @ev_ctx_host_pa: Physical address of host event context data structure 88 * @cmd_ctx_host_pa: Physical address of host command context data structure 89 * @ch_ctx_cache_phys: Physical address of the host channel context cache 90 * @ev_ctx_cache_phys: Physical address of the host event context cache 91 * @cmd_ctx_cache_phys: Physical address of the host command context cache 92 * @chdb: Array of channel doorbell interrupt info 93 * @event_lock: Lock for protecting event rings 94 * @state_lock: Lock for protecting state transitions 95 * @list_lock: Lock for protecting state transition and channel doorbell lists 96 * @st_transition_list: List of state transitions 97 * @ch_db_list: List of queued channel doorbells 98 * @wq: Dedicated workqueue for handling rings and state changes 99 * @state_work: State transition worker 100 * @reset_work: Worker for MHI Endpoint reset 101 * @cmd_ring_work: Worker for processing command rings 102 * @ch_ring_work: Worker for processing channel rings 103 * @raise_irq: CB function for raising IRQ to the host 104 * @alloc_map: CB function for allocating memory in endpoint for storing host context and mapping it 105 * @unmap_free: CB function to unmap and free the allocated memory in endpoint for storing host context 106 * @read_sync: CB function for reading from host memory synchronously 107 * @write_sync: CB function for writing to host memory synchronously 108 * @read_async: CB function for reading from host memory asynchronously 109 * @write_async: CB function for writing to host memory asynchronously 110 * @mhi_state: MHI Endpoint state 111 * @max_chan: Maximum channels supported by the endpoint controller 112 * @mru: MRU (Maximum Receive Unit) value of the endpoint controller 113 * @event_rings: Number of event rings supported by the endpoint controller 114 * @hw_event_rings: Number of hardware event rings supported by the endpoint controller 115 * @chdb_offset: Channel doorbell offset set by the host 116 * @erdb_offset: Event ring doorbell offset set by the host 117 * @index: MHI Endpoint controller index 118 * @irq: IRQ used by the endpoint controller 119 * @enabled: Check if the endpoint controller is enabled or not 120 */ 121 struct mhi_ep_cntrl { 122 struct device *cntrl_dev; 123 struct mhi_ep_device *mhi_dev; 124 void __iomem *mmio; 125 126 struct mhi_ep_chan *mhi_chan; 127 struct mhi_ep_event *mhi_event; 128 struct mhi_ep_cmd *mhi_cmd; 129 struct mhi_ep_sm *sm; 130 131 struct mhi_chan_ctxt *ch_ctx_cache; 132 struct mhi_event_ctxt *ev_ctx_cache; 133 struct mhi_cmd_ctxt *cmd_ctx_cache; 134 u64 ch_ctx_host_pa; 135 u64 ev_ctx_host_pa; 136 u64 cmd_ctx_host_pa; 137 phys_addr_t ch_ctx_cache_phys; 138 phys_addr_t ev_ctx_cache_phys; 139 phys_addr_t cmd_ctx_cache_phys; 140 141 struct mhi_ep_db_info chdb[4]; 142 struct mutex event_lock; 143 struct mutex state_lock; 144 spinlock_t list_lock; 145 146 struct list_head st_transition_list; 147 struct list_head ch_db_list; 148 149 struct workqueue_struct *wq; 150 struct work_struct state_work; 151 struct work_struct reset_work; 152 struct work_struct cmd_ring_work; 153 struct work_struct ch_ring_work; 154 struct kmem_cache *ring_item_cache; 155 struct kmem_cache *ev_ring_el_cache; 156 struct kmem_cache *tre_buf_cache; 157 158 void (*raise_irq)(struct mhi_ep_cntrl *mhi_cntrl, u32 vector); 159 int (*alloc_map)(struct mhi_ep_cntrl *mhi_cntrl, u64 pci_addr, phys_addr_t *phys_ptr, 160 void __iomem **virt, size_t size); 161 void (*unmap_free)(struct mhi_ep_cntrl *mhi_cntrl, u64 pci_addr, phys_addr_t phys, 162 void __iomem *virt, size_t size); 163 int (*read_sync)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info); 164 int (*write_sync)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info); 165 int (*read_async)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info); 166 int (*write_async)(struct mhi_ep_cntrl *mhi_cntrl, struct mhi_ep_buf_info *buf_info); 167 168 enum mhi_state mhi_state; 169 170 u32 max_chan; 171 u32 mru; 172 u32 event_rings; 173 u32 hw_event_rings; 174 u32 chdb_offset; 175 u32 erdb_offset; 176 u32 index; 177 int irq; 178 bool enabled; 179 }; 180 181 /** 182 * struct mhi_ep_device - Structure representing an MHI Endpoint device that binds 183 * to channels or is associated with controllers 184 * @dev: Driver model device node for the MHI Endpoint device 185 * @mhi_cntrl: Controller the device belongs to 186 * @id: Pointer to MHI Endpoint device ID struct 187 * @name: Name of the associated MHI Endpoint device 188 * @ul_chan: UL (from host to endpoint) channel for the device 189 * @dl_chan: DL (from endpoint to host) channel for the device 190 * @dev_type: MHI device type 191 */ 192 struct mhi_ep_device { 193 struct device dev; 194 struct mhi_ep_cntrl *mhi_cntrl; 195 const struct mhi_device_id *id; 196 const char *name; 197 struct mhi_ep_chan *ul_chan; 198 struct mhi_ep_chan *dl_chan; 199 enum mhi_device_type dev_type; 200 }; 201 202 /** 203 * struct mhi_ep_driver - Structure representing a MHI Endpoint client driver 204 * @id_table: Pointer to MHI Endpoint device ID table 205 * @driver: Device driver model driver 206 * @probe: CB function for client driver probe function 207 * @remove: CB function for client driver remove function 208 * @ul_xfer_cb: CB function for UL (from host to endpoint) data transfer 209 * @dl_xfer_cb: CB function for DL (from endpoint to host) data transfer 210 */ 211 struct mhi_ep_driver { 212 const struct mhi_device_id *id_table; 213 struct device_driver driver; 214 int (*probe)(struct mhi_ep_device *mhi_ep, 215 const struct mhi_device_id *id); 216 void (*remove)(struct mhi_ep_device *mhi_ep); 217 void (*ul_xfer_cb)(struct mhi_ep_device *mhi_dev, 218 struct mhi_result *result); 219 void (*dl_xfer_cb)(struct mhi_ep_device *mhi_dev, 220 struct mhi_result *result); 221 }; 222 223 #define to_mhi_ep_device(dev) container_of(dev, struct mhi_ep_device, dev) 224 #define to_mhi_ep_driver(drv) container_of_const(drv, struct mhi_ep_driver, driver) 225 226 /* 227 * module_mhi_ep_driver() - Helper macro for drivers that don't do 228 * anything special other than using default mhi_ep_driver_register() and 229 * mhi_ep_driver_unregister(). This eliminates a lot of boilerplate. 230 * Each module may only use this macro once. 231 */ 232 #define module_mhi_ep_driver(mhi_drv) \ 233 module_driver(mhi_drv, mhi_ep_driver_register, \ 234 mhi_ep_driver_unregister) 235 236 /* 237 * Macro to avoid include chaining to get THIS_MODULE 238 */ 239 #define mhi_ep_driver_register(mhi_drv) \ 240 __mhi_ep_driver_register(mhi_drv, THIS_MODULE) 241 242 /** 243 * __mhi_ep_driver_register - Register a driver with MHI Endpoint bus 244 * @mhi_drv: Driver to be associated with the device 245 * @owner: The module owner 246 * 247 * Return: 0 if driver registrations succeeds, a negative error code otherwise. 248 */ 249 int __mhi_ep_driver_register(struct mhi_ep_driver *mhi_drv, struct module *owner); 250 251 /** 252 * mhi_ep_driver_unregister - Unregister a driver from MHI Endpoint bus 253 * @mhi_drv: Driver associated with the device 254 */ 255 void mhi_ep_driver_unregister(struct mhi_ep_driver *mhi_drv); 256 257 /** 258 * mhi_ep_register_controller - Register MHI Endpoint controller 259 * @mhi_cntrl: MHI Endpoint controller to register 260 * @config: Configuration to use for the controller 261 * 262 * Return: 0 if controller registrations succeeds, a negative error code otherwise. 263 */ 264 int mhi_ep_register_controller(struct mhi_ep_cntrl *mhi_cntrl, 265 const struct mhi_ep_cntrl_config *config); 266 267 /** 268 * mhi_ep_unregister_controller - Unregister MHI Endpoint controller 269 * @mhi_cntrl: MHI Endpoint controller to unregister 270 */ 271 void mhi_ep_unregister_controller(struct mhi_ep_cntrl *mhi_cntrl); 272 273 /** 274 * mhi_ep_power_up - Power up the MHI endpoint stack 275 * @mhi_cntrl: MHI Endpoint controller 276 * 277 * Return: 0 if power up succeeds, a negative error code otherwise. 278 */ 279 int mhi_ep_power_up(struct mhi_ep_cntrl *mhi_cntrl); 280 281 /** 282 * mhi_ep_power_down - Power down the MHI endpoint stack 283 * @mhi_cntrl: MHI controller 284 */ 285 void mhi_ep_power_down(struct mhi_ep_cntrl *mhi_cntrl); 286 287 /** 288 * mhi_ep_queue_is_empty - Determine whether the transfer queue is empty 289 * @mhi_dev: Device associated with the channels 290 * @dir: DMA direction for the channel 291 * 292 * Return: true if the queue is empty, false otherwise. 293 */ 294 bool mhi_ep_queue_is_empty(struct mhi_ep_device *mhi_dev, enum dma_data_direction dir); 295 296 /** 297 * mhi_ep_queue_skb - Send SKBs to host over MHI Endpoint 298 * @mhi_dev: Device associated with the DL channel 299 * @skb: SKBs to be queued 300 * 301 * Return: 0 if the SKBs has been sent successfully, a negative error code otherwise. 302 */ 303 int mhi_ep_queue_skb(struct mhi_ep_device *mhi_dev, struct sk_buff *skb); 304 305 #endif 306