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+/*
+ * mostcore.h - Interface between MostCore,
+ * Hardware Dependent Module (HDM) and Application Interface Module (AIM).
+ *
+ * Copyright (C) 2013-2015, Microchip Technology Germany II GmbH & Co. KG
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * This file is licensed under GPLv2.
+ */
+
+/*
+ * Authors:
+ * Andrey Shvetsov <andrey.shvetsov@k2l.de>
+ * Christian Gromm <christian.gromm@microchip.com>
+ * Sebastian Graf
+ */
+
+#ifndef __MOST_CORE_H__
+#define __MOST_CORE_H__
+
+#include <linux/types.h>
+
+struct kobject;
+struct module;
+
+/**
+ * Interface type
+ */
+enum most_interface_type {
+ ITYPE_LOOPBACK = 1,
+ ITYPE_I2C,
+ ITYPE_I2S,
+ ITYPE_TSI,
+ ITYPE_HBI,
+ ITYPE_MEDIALB_DIM,
+ ITYPE_MEDIALB_DIM2,
+ ITYPE_USB,
+ ITYPE_PCIE
+};
+
+/**
+ * Channel direction.
+ */
+enum most_channel_direction {
+ MOST_CH_RX = 1 << 0,
+ MOST_CH_TX = 1 << 1,
+};
+
+/**
+ * Channel data type.
+ */
+enum most_channel_data_type {
+ MOST_CH_CONTROL = 1 << 0,
+ MOST_CH_ASYNC = 1 << 1,
+ MOST_CH_ISOC_AVP = 1 << 2,
+ MOST_CH_SYNC = 1 << 5,
+};
+
+enum mbo_status_flags {
+ /* MBO was processed successfully (data was send or received )*/
+ MBO_SUCCESS = 0,
+ /* The MBO contains wrong or missing information. */
+ MBO_E_INVAL,
+ /* MBO was completed as HDM Channel will be closed */
+ MBO_E_CLOSE,
+};
+
+/**
+ * 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_buffer_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_buffer_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 MostCore 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/virtual/most/mostcore/devices/mdev-#/mdev#-ch#/ 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 {
+ u16 direction;
+ u16 data_type;
+ u16 num_buffers_packet;
+ u16 buffer_size_packet;
+ u16 num_buffers_streaming;
+ u16 buffer_size_streaming;
+ char *name_suffix;
+};
+
+/**
+ * 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 MostCore 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 {
+ enum most_channel_direction direction;
+ enum most_channel_data_type data_type;
+ u16 num_buffers;
+ u16 buffer_size;
+ u16 extra_len;
+ u16 subbuffer_size;
+ u16 packets_per_xact;
+};
+
+/*
+ * 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
+ * @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 MostCore allocates and initializes the MBO.
+ *
+ * The HDM receives MBO for transfer from MostCore 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.
+ *
+ * At the end the MostCore deallocates the MBO or recycles it for further
+ * transfers for the same or 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 {
+ void *context;
+ void *priv;
+ struct list_head list;
+ struct most_interface *ifp;
+ int *num_buffers_ptr;
+ u16 hdm_channel_id;
+ void *virt_address;
+ dma_addr_t bus_address;
+ u16 buffer_length;
+ u16 processed_length;
+ enum mbo_status_flags status;
+ void (*complete)(struct mbo *);
+};
+
+/**
+ * Interface instance description.
+ *
+ * Describes one instance of an interface like Medusa PCIe or Vantage USB.
+ * This structure is allocated and initialized in the HDM. MostCore may not
+ * modify this structure.
+ *
+ * @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"
+ * @priv Private field used by mostcore to store context information.
+ */
+struct most_interface {
+ struct module *mod;
+ enum most_interface_type interface;
+ const char *description;
+ int num_channels;
+ struct most_channel_capability *channel_vector;
+ int (*configure)(struct most_interface *iface, int channel_idx,
+ struct most_channel_config *channel_config);
+ int (*enqueue)(struct most_interface *iface, int channel_idx,
+ struct mbo *mbo);
+ int (*poison_channel)(struct most_interface *iface, int channel_idx);
+ void (*request_netinfo)(struct most_interface *iface, int channel_idx);
+ void *priv;
+};
+
+/**
+ * struct most_aim - identifies MOST device driver to mostcore
+ * @name: Driver 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
+ * @context: context pointer to be used by mostcore
+ */
+struct most_aim {
+ const char *name;
+ int (*probe_channel)(struct most_interface *iface, int channel_idx,
+ struct most_channel_config *cfg,
+ struct kobject *parent, char *name);
+ int (*disconnect_channel)(struct most_interface *iface,
+ int channel_idx);
+ int (*rx_completion)(struct mbo *mbo);
+ int (*tx_completion)(struct most_interface *iface, int channel_idx);
+ void *context;
+};
+
+/**
+ * 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.
+ */
+struct kobject *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);
+int 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_aim(struct most_aim *aim);
+int most_deregister_aim(struct most_aim *aim);
+struct mbo *most_get_mbo(struct most_interface *iface, int channel_idx,
+ struct most_aim *);
+void most_put_mbo(struct mbo *mbo);
+int channel_has_mbo(struct most_interface *iface, int channel_idx,
+ struct most_aim *aim);
+int most_start_channel(struct most_interface *iface, int channel_idx,
+ struct most_aim *);
+int most_stop_channel(struct most_interface *iface, int channel_idx,
+ struct most_aim *);
+
+#endif /* MOST_CORE_H_ */