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