/* SPDX-License-Identifier: GPL-2.0 */ /* * most.h - API for component and adapter drivers * * Copyright (C) 2013-2015, Microchip Technology Germany II GmbH & Co. KG */ #ifndef __MOST_CORE_H__ #define __MOST_CORE_H__ #include <linux/types.h> #include <linux/device.h> struct module; struct interface_private; /** * Interface type */ enum most_interface_type { … }; /** * Channel direction. */ enum most_channel_direction { … }; /** * Channel data type. */ enum most_channel_data_type { … }; enum most_status_flags { … }; /** * struct most_channel_capability - Channel capability * @direction: Supported channel directions. * The value is bitwise OR-combination of the values from the * enumeration most_channel_direction. Zero is allowed value and means * "channel may not be used". * @data_type: Supported channel data types. * The value is bitwise OR-combination of the values from the * enumeration most_channel_data_type. Zero is allowed value and means * "channel may not be used". * @num_buffers_packet: Maximum number of buffers supported by this channel * for packet data types (Async,Control,QoS) * @buffer_size_packet: Maximum buffer size supported by this channel * for packet data types (Async,Control,QoS) * @num_buffers_streaming: Maximum number of buffers supported by this channel * for streaming data types (Sync,AV Packetized) * @buffer_size_streaming: Maximum buffer size supported by this channel * for streaming data types (Sync,AV Packetized) * @name_suffix: Optional suffix providean by an HDM that is attached to the * regular channel name. * * Describes the capabilities of a MOST channel like supported Data Types * and directions. This information is provided by an HDM for the MostCore. * * The Core creates read only sysfs attribute files in * /sys/devices/most/mdev#/<channel>/ with the * following attributes: * -available_directions * -available_datatypes * -number_of_packet_buffers * -number_of_stream_buffers * -size_of_packet_buffer * -size_of_stream_buffer * where content of each file is a string with all supported properties of this * very channel attribute. */ struct most_channel_capability { … }; /** * struct most_channel_config - stores channel configuration * @direction: direction of the channel * @data_type: data type travelling over this channel * @num_buffers: number of buffers * @buffer_size: size of a buffer for AIM. * Buffer size may be cutted down by HDM in a configure callback * to match to a given interface and channel type. * @extra_len: additional buffer space for internal HDM purposes like padding. * May be set by HDM in a configure callback if needed. * @subbuffer_size: size of a subbuffer * @packets_per_xact: number of MOST frames that are packet inside one USB * packet. This is USB specific * * Describes the configuration for a MOST channel. This information is * provided from the MostCore to a HDM (like the Medusa PCIe Interface) as a * parameter of the "configure" function call. */ struct most_channel_config { … }; /* * struct mbo - MOST Buffer Object. * @context: context for core completion handler * @priv: private data for HDM * * public: documented fields that are used for the communications * between MostCore and HDMs * * @list: list head for use by the mbo's current owner * @ifp: (in) associated interface instance * @num_buffers_ptr: amount of pool buffers * @hdm_channel_id: (in) HDM channel instance * @virt_address: (in) kernel virtual address of the buffer * @bus_address: (in) bus address of the buffer * @buffer_length: (in) buffer payload length * @processed_length: (out) processed length * @status: (out) transfer status * @complete: (in) completion routine * * The core allocates and initializes the MBO. * * The HDM receives MBO for transfer from the core with the call to enqueue(). * The HDM copies the data to- or from the buffer depending on configured * channel direction, set "processed_length" and "status" and completes * the transfer procedure by calling the completion routine. * * Finally, the MBO is being deallocated or recycled for further * transfers of the same or a different HDM. * * Directions of usage: * The core driver should never access any MBO fields (even if marked * as "public") while the MBO is owned by an HDM. The ownership starts with * the call of enqueue() and ends with the call of its complete() routine. * * II. * Every HDM attached to the core driver _must_ ensure that it returns any MBO * it owns (due to a previous call to enqueue() by the core driver) before it * de-registers an interface or gets unloaded from the kernel. If this direction * is violated memory leaks will occur, since the core driver does _not_ track * MBOs it is currently not in control of. * */ struct mbo { … }; /** * Interface instance description. * * Describes an interface of a MOST device the core driver is bound to. * This structure is allocated and initialized in the HDM. MostCore may not * modify this structure. * * @dev: the actual device * @mod: module * @interface Interface type. \sa most_interface_type. * @description PRELIMINARY. * Unique description of the device instance from point of view of the * interface in free text form (ASCII). * It may be a hexadecimal presentation of the memory address for the MediaLB * IP or USB device ID with USB properties for USB interface, etc. * @num_channels Number of channels and size of the channel_vector. * @channel_vector Properties of the channels. * Array index represents channel ID by the driver. * @configure Callback to change data type for the channel of the * interface instance. May be zero if the instance of the interface is not * configurable. Parameter channel_config describes direction and data * type for the channel, configured by the higher level. The content of * @enqueue Delivers MBO to the HDM for processing. * After HDM completes Rx- or Tx- operation the processed MBO shall * be returned back to the MostCore using completion routine. * The reason to get the MBO delivered from the MostCore after the channel * is poisoned is the re-opening of the channel by the application. * In this case the HDM shall hold MBOs and service the channel as usual. * The HDM must be able to hold at least one MBO for each channel. * The callback returns a negative value on error, otherwise 0. * @poison_channel Informs HDM about closing the channel. The HDM shall * cancel all transfers and synchronously or asynchronously return * all enqueued for this channel MBOs using the completion routine. * The callback returns a negative value on error, otherwise 0. * @request_netinfo: triggers retrieving of network info from the HDM by * means of "Message exchange over MDP/MEP" * The call of the function request_netinfo with the parameter on_netinfo as * NULL prohibits use of the previously obtained function pointer. * @priv Private field used by mostcore to store context information. */ struct most_interface { … }; /** * struct most_component - identifies a loadable component for the mostcore * @list: list_head * @name: component name * @probe_channel: function for core to notify driver about channel connection * @disconnect_channel: callback function to disconnect a certain channel * @rx_completion: completion handler for received packets * @tx_completion: completion handler for transmitted packets */ struct most_component { … }; /** * most_register_interface - Registers instance of the interface. * @iface: Pointer to the interface instance description. * * Returns a pointer to the kobject of the generated instance. * * Note: HDM has to ensure that any reference held on the kobj is * released before deregistering the interface. */ int most_register_interface(struct most_interface *iface); /** * Deregisters instance of the interface. * @intf_instance Pointer to the interface instance description. */ void most_deregister_interface(struct most_interface *iface); void most_submit_mbo(struct mbo *mbo); /** * most_stop_enqueue - prevents core from enqueing MBOs * @iface: pointer to interface * @channel_idx: channel index */ void most_stop_enqueue(struct most_interface *iface, int channel_idx); /** * most_resume_enqueue - allow core to enqueue MBOs again * @iface: pointer to interface * @channel_idx: channel index * * This clears the enqueue halt flag and enqueues all MBOs currently * in wait fifo. */ void most_resume_enqueue(struct most_interface *iface, int channel_idx); int most_register_component(struct most_component *comp); int most_deregister_component(struct most_component *comp); struct mbo *most_get_mbo(struct most_interface *iface, int channel_idx, struct most_component *comp); void most_put_mbo(struct mbo *mbo); int channel_has_mbo(struct most_interface *iface, int channel_idx, struct most_component *comp); int most_start_channel(struct most_interface *iface, int channel_idx, struct most_component *comp); int most_stop_channel(struct most_interface *iface, int channel_idx, struct most_component *comp); int __init configfs_init(void); int most_register_configfs_subsys(struct most_component *comp); void most_deregister_configfs_subsys(struct most_component *comp); int most_add_link(char *mdev, char *mdev_ch, char *comp_name, char *link_name, char *comp_param); int most_remove_link(char *mdev, char *mdev_ch, char *comp_name); int most_set_cfg_buffer_size(char *mdev, char *mdev_ch, u16 val); int most_set_cfg_subbuffer_size(char *mdev, char *mdev_ch, u16 val); int most_set_cfg_dbr_size(char *mdev, char *mdev_ch, u16 val); int most_set_cfg_num_buffers(char *mdev, char *mdev_ch, u16 val); int most_set_cfg_datatype(char *mdev, char *mdev_ch, char *buf); int most_set_cfg_direction(char *mdev, char *mdev_ch, char *buf); int most_set_cfg_packets_xact(char *mdev, char *mdev_ch, u16 val); int most_cfg_complete(char *comp_name); void most_interface_register_notify(const char *mdev_name); #endif /* MOST_CORE_H_ */
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