132 lines
3.7 KiB
C
132 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Greybus connections
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*
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* Copyright 2014 Google Inc.
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* Copyright 2014 Linaro Ltd.
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*/
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#ifndef __CONNECTION_H
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#define __CONNECTION_H
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#include <linux/bits.h>
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#include <linux/list.h>
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#include <linux/kfifo.h>
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#include <linux/kref.h>
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#include <linux/workqueue.h>
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#define GB_CONNECTION_FLAG_CSD BIT(0)
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#define GB_CONNECTION_FLAG_NO_FLOWCTRL BIT(1)
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#define GB_CONNECTION_FLAG_OFFLOADED BIT(2)
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#define GB_CONNECTION_FLAG_CDSI1 BIT(3)
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#define GB_CONNECTION_FLAG_CONTROL BIT(4)
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#define GB_CONNECTION_FLAG_HIGH_PRIO BIT(5)
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#define GB_CONNECTION_FLAG_CORE_MASK GB_CONNECTION_FLAG_CONTROL
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enum gb_connection_state {
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GB_CONNECTION_STATE_DISABLED = 0,
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GB_CONNECTION_STATE_ENABLED_TX = 1,
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GB_CONNECTION_STATE_ENABLED = 2,
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GB_CONNECTION_STATE_DISCONNECTING = 3,
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};
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struct gb_operation;
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typedef int (*gb_request_handler_t)(struct gb_operation *);
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struct gb_connection {
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struct gb_host_device *hd;
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struct gb_interface *intf;
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struct gb_bundle *bundle;
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struct kref kref;
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u16 hd_cport_id;
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u16 intf_cport_id;
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struct list_head hd_links;
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struct list_head bundle_links;
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gb_request_handler_t handler;
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unsigned long flags;
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struct mutex mutex;
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spinlock_t lock;
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enum gb_connection_state state;
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struct list_head operations;
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char name[16];
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struct workqueue_struct *wq;
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atomic_t op_cycle;
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void *private;
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bool mode_switch;
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};
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struct gb_connection *gb_connection_create_static(struct gb_host_device *hd,
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u16 hd_cport_id, gb_request_handler_t handler);
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struct gb_connection *gb_connection_create_control(struct gb_interface *intf);
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struct gb_connection *gb_connection_create(struct gb_bundle *bundle,
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u16 cport_id, gb_request_handler_t handler);
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struct gb_connection *gb_connection_create_flags(struct gb_bundle *bundle,
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u16 cport_id, gb_request_handler_t handler,
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unsigned long flags);
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struct gb_connection *gb_connection_create_offloaded(struct gb_bundle *bundle,
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u16 cport_id, unsigned long flags);
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void gb_connection_destroy(struct gb_connection *connection);
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static inline bool gb_connection_is_static(struct gb_connection *connection)
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{
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return !connection->intf;
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}
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int gb_connection_enable(struct gb_connection *connection);
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int gb_connection_enable_tx(struct gb_connection *connection);
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void gb_connection_disable_rx(struct gb_connection *connection);
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void gb_connection_disable(struct gb_connection *connection);
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void gb_connection_disable_forced(struct gb_connection *connection);
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void gb_connection_mode_switch_prepare(struct gb_connection *connection);
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void gb_connection_mode_switch_complete(struct gb_connection *connection);
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void greybus_data_rcvd(struct gb_host_device *hd, u16 cport_id,
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u8 *data, size_t length);
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void gb_connection_latency_tag_enable(struct gb_connection *connection);
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void gb_connection_latency_tag_disable(struct gb_connection *connection);
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static inline bool gb_connection_e2efc_enabled(struct gb_connection *connection)
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{
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return !(connection->flags & GB_CONNECTION_FLAG_CSD);
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}
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static inline bool
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gb_connection_flow_control_disabled(struct gb_connection *connection)
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{
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return connection->flags & GB_CONNECTION_FLAG_NO_FLOWCTRL;
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}
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static inline bool gb_connection_is_offloaded(struct gb_connection *connection)
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{
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return connection->flags & GB_CONNECTION_FLAG_OFFLOADED;
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}
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static inline bool gb_connection_is_control(struct gb_connection *connection)
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{
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return connection->flags & GB_CONNECTION_FLAG_CONTROL;
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}
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static inline void *gb_connection_get_data(struct gb_connection *connection)
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{
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return connection->private;
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}
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static inline void gb_connection_set_data(struct gb_connection *connection,
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void *data)
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{
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connection->private = data;
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}
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#endif /* __CONNECTION_H */
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