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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | ||
3 | /* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved. | |
a4388da5 | 4 | * Copyright (C) 2018-2022 Linaro Ltd. |
ca48b27b AE |
5 | */ |
6 | #ifndef _GSI_PRIVATE_H_ | |
7 | #define _GSI_PRIVATE_H_ | |
8 | ||
9 | /* === Only "gsi.c" and "gsi_trans.c" should include this file === */ | |
10 | ||
11 | #include <linux/types.h> | |
12 | ||
13 | struct gsi_trans; | |
14 | struct gsi_ring; | |
15 | struct gsi_channel; | |
16 | ||
19aaf72c | 17 | #define GSI_RING_ELEMENT_SIZE 16 /* bytes; must be a power of 2 */ |
ca48b27b | 18 | |
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19 | /** |
20 | * gsi_trans_move_complete() - Mark a GSI transaction completed | |
ace5dc61 | 21 | * @trans: Transaction whose state is to be updated |
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22 | */ |
23 | void gsi_trans_move_complete(struct gsi_trans *trans); | |
24 | ||
25 | /** | |
26 | * gsi_trans_move_polled() - Mark a transaction polled | |
ace5dc61 | 27 | * @trans: Transaction whose state is to be updated |
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28 | */ |
29 | void gsi_trans_move_polled(struct gsi_trans *trans); | |
30 | ||
31 | /** | |
32 | * gsi_trans_complete() - Complete a GSI transaction | |
33 | * @trans: Transaction to complete | |
34 | * | |
35 | * Marks a transaction complete (including freeing it). | |
36 | */ | |
37 | void gsi_trans_complete(struct gsi_trans *trans); | |
38 | ||
39 | /** | |
40 | * gsi_channel_trans_mapped() - Return a transaction mapped to a TRE index | |
41 | * @channel: Channel associated with the transaction | |
42 | * @index: Index of the TRE having a transaction | |
43 | * | |
e3eea08e | 44 | * Return: The GSI transaction pointer associated with the TRE index |
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45 | */ |
46 | struct gsi_trans *gsi_channel_trans_mapped(struct gsi_channel *channel, | |
47 | u32 index); | |
48 | ||
49 | /** | |
50 | * gsi_channel_trans_complete() - Return a channel's next completed transaction | |
51 | * @channel: Channel whose next transaction is to be returned | |
52 | * | |
e3eea08e | 53 | * Return: The next completed transaction, or NULL if nothing new |
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54 | */ |
55 | struct gsi_trans *gsi_channel_trans_complete(struct gsi_channel *channel); | |
56 | ||
57 | /** | |
58 | * gsi_channel_trans_cancel_pending() - Cancel pending transactions | |
59 | * @channel: Channel whose pending transactions should be cancelled | |
60 | * | |
61 | * Cancel all pending transactions on a channel. These are transactions | |
62 | * that have been committed but not yet completed. This is required when | |
63 | * the channel gets reset. At that time all pending transactions will be | |
64 | * marked as cancelled. | |
65 | * | |
66 | * NOTE: Transactions already complete at the time of this call are | |
67 | * unaffected. | |
68 | */ | |
69 | void gsi_channel_trans_cancel_pending(struct gsi_channel *channel); | |
70 | ||
71 | /** | |
72 | * gsi_channel_trans_init() - Initialize a channel's GSI transaction info | |
73 | * @gsi: GSI pointer | |
74 | * @channel_id: Channel number | |
75 | * | |
e3eea08e | 76 | * Return: 0 if successful, or -ENOMEM on allocation failure |
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77 | * |
78 | * Creates and sets up information for managing transactions on a channel | |
79 | */ | |
80 | int gsi_channel_trans_init(struct gsi *gsi, u32 channel_id); | |
81 | ||
82 | /** | |
83 | * gsi_channel_trans_exit() - Inverse of gsi_channel_trans_init() | |
84 | * @channel: Channel whose transaction information is to be cleaned up | |
85 | */ | |
86 | void gsi_channel_trans_exit(struct gsi_channel *channel); | |
87 | ||
88 | /** | |
89 | * gsi_channel_doorbell() - Ring a channel's doorbell | |
90 | * @channel: Channel whose doorbell should be rung | |
91 | * | |
92 | * Rings a channel's doorbell to inform the GSI hardware that new | |
93 | * transactions (TREs, really) are available for it to process. | |
94 | */ | |
95 | void gsi_channel_doorbell(struct gsi_channel *channel); | |
96 | ||
e0e3406c | 97 | /* gsi_channel_update() - Update knowledge of channel hardware state |
019e37ea | 98 | * @channel: Channel to be updated |
e0e3406c | 99 | * |
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100 | * Consult hardware, change the state of any newly-completed transactions |
101 | * on a channel. | |
e0e3406c | 102 | */ |
019e37ea | 103 | void gsi_channel_update(struct gsi_channel *channel); |
e0e3406c | 104 | |
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105 | /** |
106 | * gsi_ring_virt() - Return virtual address for a ring entry | |
107 | * @ring: Ring whose address is to be translated | |
862d3f2c | 108 | * @index: Index (slot number) of entry |
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109 | */ |
110 | void *gsi_ring_virt(struct gsi_ring *ring, u32 index); | |
111 | ||
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112 | /** |
113 | * gsi_trans_tx_committed() - Record bytes committed for transmit | |
114 | * @trans: TX endpoint transaction being committed | |
115 | * | |
116 | * Report that a TX transaction has been committed. It updates some | |
117 | * statistics used to manage transmit rates. | |
118 | */ | |
119 | void gsi_trans_tx_committed(struct gsi_trans *trans); | |
120 | ||
ca48b27b | 121 | /** |
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122 | * gsi_trans_tx_queued() - Report a queued TX channel transaction |
123 | * @trans: Transaction being passed to hardware | |
ca48b27b | 124 | * |
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125 | * Report to the network stack that a TX transaction is being supplied |
126 | * to the hardware. | |
ca48b27b | 127 | */ |
bcec9ecb | 128 | void gsi_trans_tx_queued(struct gsi_trans *trans); |
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129 | |
130 | #endif /* _GSI_PRIVATE_H_ */ |