90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
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/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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*/
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#ifndef __VBUS_API_H__
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#define __VBUS_API_H__
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#define RT_VBUS_USING_FLOW_CONTROL
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#define RT_VBUS_CHANNEL_NR 32
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#define RT_VBUS_BLK_HEAD_SZ 4
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#define RT_VBUS_MAX_PKT_SZ (256 - RT_VBUS_BLK_HEAD_SZ)
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#define RT_VMM_RB_BLK_NR (_RT_VBUS_RING_SZ / 64 - 1)
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#ifndef __ASSEMBLY__
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#include <stddef.h> /* For size_t */
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struct rt_vbus_blk
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{
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unsigned char id;
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unsigned char qos;
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unsigned char len;
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unsigned char reserved;
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unsigned char data[60];
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} __attribute__((packed));
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struct rt_vbus_ring
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{
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volatile size_t put_idx;
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volatile size_t get_idx;
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/* whether the writer is blocked on this ring. For RTT, it means the
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* central writer thread is waiting. For Linux, it means there are some
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* threads waiting for space to write.
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*
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* Note that we don't record whether there are reading thread blocked. When
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* there is new data, the other side will always be waked up. */
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volatile unsigned int blocked;
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struct rt_vbus_blk blks[RT_VMM_RB_BLK_NR];
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};
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enum
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{
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RT_VBUS_CHN0_CMD_ENABLE,
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RT_VBUS_CHN0_CMD_DISABLE,
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RT_VBUS_CHN0_CMD_SET,
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RT_VBUS_CHN0_CMD_ACK,
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RT_VBUS_CHN0_CMD_NAK,
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/* If the recieving side reached high water mark. It has the right to
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* suspend the channel. All the server/client should know about this
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* command but the one that does not implement flow control could ignore
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* this command. */
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RT_VBUS_CHN0_CMD_SUSPEND,
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RT_VBUS_CHN0_CMD_RESUME,
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RT_VBUS_CHN0_CMD_MAX,
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};
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enum rt_vbus_chn_status
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{
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/* initial state, available for reuse */
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RT_VBUS_CHN_ST_AVAILABLE,
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/* ACK DISABLE send(CS) or received(CS), but not ready for reuse.(the
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* channel is not closed by this end) */
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RT_VBUS_CHN_ST_CLOSED,
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/* ENABLE send(client) or received(server) */
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RT_VBUS_CHN_ST_ESTABLISHING,
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/* ACK SET send(C) or received(S) */
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RT_VBUS_CHN_ST_ESTABLISHED,
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/* Channel suspended by flow control. */
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RT_VBUS_CHN_ST_SUSPEND,
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/* DISABLE received(CS) */
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RT_VBUS_CHN_ST_CLOSING,
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};
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#endif
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#undef BUILD_ASSERT
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/* borrowed from http://lxr.linux.no/linux+v2.6.26.5/include/linux/kernel.h#L494 */
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#define BUILD_ASSERT(condition) ((void)sizeof(char[1 - 2*!(condition)]))
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/* max length of a channel name, including the \0 */
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#define RT_VBUS_CHN_NAME_MAX 16
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#endif /* end of include guard: __VBUS_API_H__ */
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