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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
* Copyright (C) 2018-2020 Linaro Ltd.
*/
#ifndef _GSI_PRIVATE_H_
#define _GSI_PRIVATE_H_
/* === Only "gsi.c" and "gsi_trans.c" should include this file === */
#include <linux/types.h>
struct gsi_trans;
struct gsi_ring;
struct gsi_channel;
#define GSI_RING_ELEMENT_SIZE 16 /* bytes; must be a power of 2 */
/* Return the entry that follows one provided in a transaction pool */
void *gsi_trans_pool_next(struct gsi_trans_pool *pool, void *element);
/**
* gsi_trans_move_complete() - Mark a GSI transaction completed
* @trans: Transaction to commit
*/
void gsi_trans_move_complete(struct gsi_trans *trans);
/**
* gsi_trans_move_polled() - Mark a transaction polled
* @trans: Transaction to update
*/
void gsi_trans_move_polled(struct gsi_trans *trans);
/**
* gsi_trans_complete() - Complete a GSI transaction
* @trans: Transaction to complete
*
* Marks a transaction complete (including freeing it).
*/
void gsi_trans_complete(struct gsi_trans *trans);
/**
* gsi_channel_trans_mapped() - Return a transaction mapped to a TRE index
* @channel: Channel associated with the transaction
* @index: Index of the TRE having a transaction
*
* Return: The GSI transaction pointer associated with the TRE index
*/
struct gsi_trans *gsi_channel_trans_mapped(struct gsi_channel *channel,
u32 index);
/**
* gsi_channel_trans_complete() - Return a channel's next completed transaction
* @channel: Channel whose next transaction is to be returned
*
* Return: The next completed transaction, or NULL if nothing new
*/
struct gsi_trans *gsi_channel_trans_complete(struct gsi_channel *channel);
/**
* gsi_channel_trans_cancel_pending() - Cancel pending transactions
* @channel: Channel whose pending transactions should be cancelled
*
* Cancel all pending transactions on a channel. These are transactions
* that have been committed but not yet completed. This is required when
* the channel gets reset. At that time all pending transactions will be
* marked as cancelled.
*
* NOTE: Transactions already complete at the time of this call are
* unaffected.
*/
void gsi_channel_trans_cancel_pending(struct gsi_channel *channel);
/**
* gsi_channel_trans_init() - Initialize a channel's GSI transaction info
* @gsi: GSI pointer
* @channel_id: Channel number
*
* Return: 0 if successful, or -ENOMEM on allocation failure
*
* Creates and sets up information for managing transactions on a channel
*/
int gsi_channel_trans_init(struct gsi *gsi, u32 channel_id);
/**
* gsi_channel_trans_exit() - Inverse of gsi_channel_trans_init()
* @channel: Channel whose transaction information is to be cleaned up
*/
void gsi_channel_trans_exit(struct gsi_channel *channel);
/**
* gsi_channel_doorbell() - Ring a channel's doorbell
* @channel: Channel whose doorbell should be rung
*
* Rings a channel's doorbell to inform the GSI hardware that new
* transactions (TREs, really) are available for it to process.
*/
void gsi_channel_doorbell(struct gsi_channel *channel);
/**
* gsi_ring_virt() - Return virtual address for a ring entry
* @ring: Ring whose address is to be translated
* @index: Index (slot number) of entry
*/
void *gsi_ring_virt(struct gsi_ring *ring, u32 index);
/**
* gsi_channel_tx_queued() - Report the number of bytes queued to hardware
* @channel: Channel whose bytes have been queued
*
* This arranges for the the number of transactions and bytes for
* transfer that have been queued to hardware to be reported. It
* passes this information up the network stack so it can be used to
* throttle transmissions.
*/
void gsi_channel_tx_queued(struct gsi_channel *channel);
#endif /* _GSI_PRIVATE_H_ */
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